Relevant bibliographies by topics / Hofmann reaction

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Academic literature on the topic 'Hofmann reaction'

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Published: 28 September 2022

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Journal articles on the topic "Hofmann reaction"

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Rane, Dhananjay S., and Man M. Sharma. "New strategies for the Hofmann reaction." Journal of Chemical Technology AND Biotechnology 59, no. 3 (March 1994): 271–77. http://dx.doi.org/10.1002/jctb.280590310.

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Martínez, Claudio, and Kilian Muñiz. "An Iodine-Catalyzed Hofmann-Löffler Reaction." Angewandte Chemie International Edition 54, no. 28 (May 28, 2015): 8287–91. http://dx.doi.org/10.1002/anie.201501122.

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Debnath, Pradip. "Recent Advances in the Hofmann Rearrangement and Its Application to Natural Product Synthesis." Current Organic Chemistry 23, no. 22 (January 8, 2020): 2402–35. http://dx.doi.org/10.2174/1385272823666191021115508.

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: C-N bond formation reactions are the most important transformations in (bio)organic chemistry because of the widespread occurrence of amines in pharmaceuticals, natural products, and biologically active compounds. The Hofmann rearrangement is a well-known method used for the preparation of primary amines from amides. But, the traditional version of the Hofmann rearrangement often gave relatively poor yields due to over-oxidation or due to the poor solubility of some amides in aqueous base, and created an enormous amount of waste products. Developments over the last two decades, in particular, have focused on refining both of these factors affecting the reaction. This review covers both the description of recent advances (2000-2019) in the Hofmann rearrangements and its applications in the synthesis of heterocycles, natural products and complex molecules of biological interest. It is revealed that organo-catalytic systems especially hypervalent iodine-based catalysts have been developed for the green and environmentally friendly conversion of carboxamides to primary amines and carbamates.
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Gao, Wenjing, Yameng Wan, Zhiguo Zhang, Hao Wu, Tongxin Liu, and Guisheng Zhang. "The Hofmann reaction involving annulation of o-(pyridin-2-yl)aryl amides selectively and rapidly leads to potential photocatalytically active 6H-pyrido[1,2-c]quinazolin-6-one derivatives." Green Chemistry 22, no. 22 (2020): 7955–61. http://dx.doi.org/10.1039/d0gc02777d.

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An intramolecular Hofmann reaction leads to diverse photocatalytically active 6H-pyrido[1,2-c] quinazolin-6-one derivatives with the advantages of mild reaction conditions, short reaction time, excellent yields, broad substrate scope and high FG tolerance.
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RANE, D. S., and M. M. SHARMA. "ChemInform Abstract: New Strategies for the Hofmann Reaction." ChemInform 25, no. 41 (August 18, 2010): no. http://dx.doi.org/10.1002/chin.199441082.

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Troev, K., and D. Max Roundhill. "HOFMANN ELIMINATION REACTION WITH PHOSPHORUS CONTAINING ALKYLAMMONIUM SALTS." Phosphorous and Sulfur and the Related Elements 37, no. 3-4 (June 1988): 243–45. http://dx.doi.org/10.1080/03086648808079044.

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Martinez, Claudio, and Kilian Muniz. "ChemInform Abstract: An Iodine-Catalyzed Hofmann-Loeffler Reaction." ChemInform 46, no. 45 (October 22, 2015): no. http://dx.doi.org/10.1002/chin.201545130.

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Sumi, Kenzo, Takao Ikariya, and Ryoji Noyori. "Efficient synthesis of optically active 2-amino-2'-diphenylphosphino-1,1'-binaphthyl and its derivatives." Canadian Journal of Chemistry 78, no. 6 (June 1, 2000): 697–703. http://dx.doi.org/10.1139/v99-248.

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Optically active 2-amino-2'-diphenylphosphino-1,1'-binaphthyls having various functional groups, such as amino, alkoxycarbonylamino, acylamino, mono- and dialkylamino, and sulfonylamino at C2 position were prepared. The key intermediate of the above aminophosphines was 2-carbamoyl-2'-diphenylphosphinyl-1,1'-binaphthyl synthesized from optically active 2-cyano-2'-diphenylphosphinyl-1,1'-binaphthyl. The transformation of the carbamoyl group to an amino group was effected by the Hofmann reaction.Key words: aminophosphine ligand, Hofmann reaction, optically active phosphine ligand.
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Xu, Qing, Huamei Xie, Er-Lei Zhang, Xiantao Ma, Jianhui Chen, Xiao-Chun Yu, and Huan Li. "Selective catalytic Hofmann N-alkylation of poor nucleophilic amines and amides with catalytic amounts of alkyl halides." Green Chemistry 18, no. 14 (2016): 3940–44. http://dx.doi.org/10.1039/c6gc00938g.

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A selective Hofmann N-alkylation reaction of amines/amides catalytic in alkyl halides is achieved by using alcohols as the alkylating reagents, affording mono- or di-alkylated amines/amides in high selectivities.
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Rao, M. L. Bhaskara, and Santi R. Palit. "Preparation of a Polyampholyte from Polyacrylonitrile by the Hofmann Reaction." Journal of Polymer Science Part C: Polymer Symposia 22, no. 2 (March 13, 2007): 587–90. http://dx.doi.org/10.1002/polc.5070220204.

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Dissertations / Theses on the topic "Hofmann reaction"

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Del, Castillo Fernández Estefanía. "Applications of the Hofmann-Löffler reaction for C-H functionalization in Total Synthesis." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670691.

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Aquesta tesi doctoral representa alguns avenços en el camp de la funcionalització d’enllaç C-H alifàtics. És necessari el desenvolupament de nous mètodes per a la funcionalització selectiva en molècules orgàniques. Per portar a terme aquestes estratègies, els radicals de nitrogen semblen perfectes candidats per generar selectivament enllaços de C-X en posicions no activades. Aquests radicals de nitrogen han estat usats com a intermedis reactius en química sintètica en les darreres dècades, portant a cap la química de transferència d’àtoms d’hidrogen, on la coneguda reacció de Hofmann-Löffler va ser pionera. El primer projecte està basat en el concepte de reacció de Hofmann interrompuda per a l’halogenació selectiva de molècules orgàniques. Per això, vam usar sulfonamides y èsters de sulfamats com a grups dirigents de processos de 1.5 i 1,6 de transferència d’àtoms d’hidrogen per generar radicals centrats en carboni en posicions γ o δ. Aquests radicals son atrapats per àtoms d’halògens donant accés a compostos orgànics amb múltiples halògens en la seva estructura com a estructures cícliques i acícliques. En alguns casos, halogenació veïnal o geminal va ser observada. La segona i tercera part de la tesi aquesta relacionada amb l’ús de la reacció de Hofmann-Löffler per a la formació de l’anell de pirrolidina en alcaloides. La combinació de iode hipervalent amb quantitat catalítica de iode va ser una bona estratègia per a l'aminació en l'última etapa de la síntesi enantioselectiva de la nicotina. Per últim, en la tercera part de la Tesis demostra que aquesta metodologia podria aplicar-se a molècules més complexes podent sintetitzar l’estructura del hasubanan de forma enantioselectiva on la formació de pirrolidina es produeix en els darrers passos de la síntesi.
Esta tesis doctoral representa algunos avances en el campo de la funcionalización de enlace C-H alifáticos. Es necesario el desarrollo de nuevos métodos para la funcionalización selectiva en moléculas orgánicas. Para llevar a cabo estas estrategias, los radicales de nitrógeno parecen perfectos candidatos para generar selectivamente enlaces de C-X en posiciones no activadas. Estos radicales de nitrógeno han sido usados como intermedios reactivos en química sintética en las últimas decadas, llevando a cabo la química de transferencia de átomos de hidrógeno, donde la conocida reacción de Hofmann-Löffler fue pionera. El primer Proyecto esta basado en el concepto de reacción de Hofmann interrumpida para la halogenación selectiva de moléculas orgánicas. Para ello, empleamos sulfonamidas y esteres de sulfamatos como grupos dirigentes de procesos de 1.5 y 1,6 de transferencia de átomos de hidrógeno para generar radicales centrados en carbono en posiciones γ or δ. Estos radicales son atrapados por átomos de halógenos dando acceso a compuestos orgánicos con múltiples halógenos en su estructura como estructuras cíclicas y acíclicas. En algunos casos, halogenacion vecinal o geminal fue observada. La segunda y tercera parte de la tesis esta relacionada con el uso de la reacción de Hofmann-Löffler para la formación del anillo de pirrolidina en alcaloides. La combinación de yodo hipervalente con cantidad catalítica de yodo pareció ser una buena estrategia para la aminación en la última etapa de la síntesis enantioselectiva de la nicotina. Por último, en la tercera parte de la Tesis demostramos que esta metodología podría aplicarse a moléculas más complejas pudiendo sintetizar la estructura del hasubanan de forma enantioselectiva donde la formación de pirrolidina se produce en los últimos pasos de la síntesis.
This doctoral Thesis summarizes advances in the field of C-H functionalization of aliphatic bonds. Methods for remote functionalization are necessary to expand the transformations available in the organic molecules. For this transformation, nitrogen-centered radicals are the perfect candidates to promote selective C-X bond formation over unactivated and distal C-H bonds. Nitrogen-centered radicals have been widely used as reactive intermediates in synthetic chemistry in the last decades, carrying out hydrogen atom transfer chemistry, where the well-known Hofmann-Löffler reaction was pioneering. The first research project is based on the concept of ‘interrupted Hofmann-Löffler’ reaction to the selective halogenation of organic molecules. For that, we employed sulfonamides or sulfamates esters as directing/protecting group of the transformation. These directing groups promote 1,5 or 1,6-hydrogen atom transfer generating the carbon-centered radical at γ or δ-positions. This radical is trapped by the addition of a halogen atom at this position. This protocol provided access to multiple halogenated organic compounds, such as cyclic and acyclic structures. In some cases, vicinal and geminal halogenation is observed. The second and the third part of my doctoral Thesis is related to the application of the Hofmann-Löffler reaction for the formation of the pyrrolidine ring into some alkaloids. The combination of hypervalent iodine(III) species with catalytic amount of molecular iodine seemed to be a robust tool for late-stage amination in the enantioselective synthesis of nicotine. In this regard, in the last part of the Thesis we demonstrated that this methodology could be applied to more complex molecules being able to synthesize the enantioselective hasubanan core where the pyrrolidine formation occurred in the last steps of the synthesis.
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Hofmann, Monika [Verfasser], and Harald [Akademischer Betreuer] Kolmar. "Influence of the Maillard reaction on the allergenicity of food allergens / Monika Hofmann. Betreuer: Harald Kolmar." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/1110979533/34.

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Nicolas, Mathieu. "Synthèse de copolymères ioniques réactifs pour la fonctionnalisation de nanocellulose : application au développement de membranes échangeuses d’ions." Thesis, Lyon, 2021. https://tel.archives-ouvertes.fr/tel-03789605.

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Les membranes échangeuses d’ions (ou membranes électrolytes) actuellement utilisées au sein des dispositifs de stockage électrochimique (batteries et piles à combustibles) sont généralement issues d’une synthèse polluante, complexe et coûteuse. L’archétype le plus étudié est un ionomère perfluorosulfoné connu sous le nom de Nafion, qui remplit les prérequis d’une membrane ionique performante : haute résistance mécanique et thermochimique, conduction ionique élevée et faible gonflement. La nanocellulose est un matériau polymère biosourcé pouvant être utilisé pour la production de membranes appelées nanopapiers et possédant une excellente résistance mécanique. Cependant, ces matériaux doivent être modifiés chimiquement pour remplir le rôle d’une membrane électrolyte. L’objectif de cette thèse est donc de synthétiser de nouvelles membranes électrolytes à partir du greffage de copolyélectrolytes réactifs sur la surface de nanocelluloses. Cette étape de greffage « onto » repose sur la présence de fonctions amines primaires réactives au sein du copolyélectrolyte. Celles-ci pourront réagir par amination réductrice avec des fonctions aldéhydes localisées sur la surface des nanocelluloses et préalablement introduites par une étape d’oxydation au périodate de sodium (NaIO4). Dans une première partie, la copolymérisation radicalaire a été utilisée pour synthétiser ces polyélectrolytes réactifs suivant deux approches distinctes. La première approche a consisté à modifier un précopolymère poly(styrène sulfonate)-co-poly(acrylamide) (PSS-PAA) par la réaction de Hofmann pour former un poly(styrène sulfonate)-co-poly(vinylamine) (PSS-PVAm) contenant entre 6 et 58% de fonctions amines. La seconde approche a été basée sur la modification chimique d’un copolymère poly(styrène sulfonate)-co-poly(chlorométhyl styrène) (PSS-PCMS) par une diamine via une substitution nucléophile, afin d’obtenir le dérivé aminé poly(styrène sulfonate)-co-poly(benzylamine) (PSS-PBA). Dans un deuxième temps, le greffage de polyamines commerciales et des copolyélectrolytes synthétisés par amination réductrice sur des nanocelluloses oxydées a été étudié. En particulier, il a été montré que la quantité de polyamine commerciale greffée sur la nanocellulose pouvait être simplement ajustée avec les principaux paramètres expérimentaux, atteignant ainsi une IEC de 4,5 meq/g. Le greffage des copolyélectrolytes synthétisés était cependant limité par des problématiques de solubilisation de fragments cellulosiques. Dans une troisième partie, une première preuve de concept de membrane électrolyte associant nanocellulose et polyamine commerciale par amination réductrice a été mise en évidence. L’étude de l’influence de sa composition sur la conductivité ionique et les propriétés mécaniques ont montré une augmentation de la conductivité jusqu’à 1,1 mS/cm pour les membranes les plus riches en polyamines (3,1 meq/g), la contrainte à la rupture maximale (4,0 MPa) ayant été mesurée pour une valeur d’IEC intermédiaire de 1,6 meq/g
Ion exchange membranes (or electrolyte membranes) currently used in electrochemical storage devices (batteries and fuel cells) are generally the result of a polluting, complex and expensive synthesis. The most studied architecture is a perfluorosulfonated ionomer known as Nafion, which fulfills almost all the prerequisites of a high-performance ion membrane: high mechanical and thermochemical resistance, high ionic conduction and low swelling. Nanocellulose is a biosourced polymer material that can be used for the production of membranes, also called nanopapers with excellent mechanical strength. However, these materials must be chemically modified to fulfill the role of a polymer electrolyte membrane. The objective of this thesis is therefore to synthesize new electrolyte membranes from the surface grafting of reactive copolyélectrolytes to nanocelluloses. This “grafting onto” technique is based on the presence of reactive primary amine functions within the copolyélectrolyte. These may react by reductive amination with aldehyde functions located on the surface of nanocelluloses and previously introduced by a sodium periodate (NaIO4) oxidation step. In the first place, radical copolymerization was used to synthesize these reactive polyelectrolytes following two distinct approaches. The first approach consisted in modifying a poly(styrene sulfonate)-co-poly(acrylamide) precopolymer (PSS-PAA) by the Hofmann reaction to form a poly(styrene sulfonate)-co-poly(vinylamine) (PSS-PVAm) containing between 6 and 58% of amine functions. The second approach was based on the chemical modification of a poly(styrene sulfonate)-co-poly(chloromethyl styrene) copolymer (PSS-PCMS) by a diamine via nucleophilic substitution to obtain the amino derivative poly(styrene sulfonate)-co-poly(benzylamine) (PSS-PBA). In a second part, the grafting of commercial polyamines and synthetized copolyelectrolytes onto oxidized nanocelluloses by reductive amination was studied. In particular, it was shown that the amount of grafted commercial polyamine could be simply adjusted with the main experimental parameters, reaching an IEC of 4.5 meq/g. However, the grafting of the synthesized copolyelectrolytes was limited by issues of solubilization of cellulosic fragments. The study of the influence of the membrane composition on ionic conductivity and mechanical properties showed an increase in conductivity up to 1.1 mS/cm (3.1 meq/g), while the maximum tensile strength (4.0 MPa) was measured for an intermediate IEC value of 1.6 meq/g
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Hofmann, Tobias Wolfgang [Verfasser], and Joachim [Akademischer Betreuer] Spatz. "Applying microdroplets as label-free sensors for reactions inside the droplets / Tobias Wolfgang Hofmann ; Betreuer: Joachim Spatz." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177148498/34.

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Hofmann, Tobias [Verfasser], and Joachim [Akademischer Betreuer] Spatz. "Applying microdroplets as label-free sensors for reactions inside the droplets / Tobias Wolfgang Hofmann ; Betreuer: Joachim Spatz." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:16-heidok-146445.

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Sankaramangalam, Ulhas Sharath [Verfasser], Lambert [Akademischer Betreuer] Alff, Thomas [Akademischer Betreuer] Schröder, Wolfgang [Akademischer Betreuer] Donner, and Klaus [Akademischer Betreuer] Hofmann. "Defect Engineering in HfO2/TiN-based Resistive Random Access Memory (RRAM) Devices by Reactive Molecular Beam Epitaxy / Sharath Sankaramangalam Ulhas ; Lambert Alff, Thomas Schröder, Wolfgang Donner, Klaus Hofmann." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1156462061/34.

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Hofmann, Jan Philipp [Verfasser]. "Structural dynamics of chlorinated ruthenium dioxide model catalysts under reaction conditions / von Jan Philipp Hofmann." 2009. http://d-nb.info/1001871391/34.

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Book chapters on the topic "Hofmann reaction"

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Li, Jie Jack. "Hofmann rearrangement (Hofmann degradation reaction)." In Name Reactions, 168. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04835-1_134.

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Li, Jie Jack. "Hofmann rearrangement (Hofmann degradation reaction)." In Name Reactions, 192. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_144.

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Li, Jie Jack. "Hofmann—Martius reaction." In Name Reactions, 170–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04835-1_136.

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Li, Jie Jack. "Hofmann-Martius reaction." In Name Reactions, 194–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_146.

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Li, Jie Jack. "Hofmann—Löffler—Freytag reaction." In Name Reactions, 169. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04835-1_135.

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Li, Jie Jack. "Hofmann–Löffler–Freytag reaction." In Name Reactions, 292–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01053-8_128.

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Li, Jie Jack. "Hofmann–Löffler–Freytag reaction." In Name Reactions, 321–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03979-4_137.

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Li, Jie Jack. "Hofmann-Löffler-Freytag reaction." In Name Reactions, 193. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_145.

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Li, Jie Jack. "Hofmann–Löffler–Freytag Reaction." In Name Reactions, 259–61. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-50865-4_69.

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Li, Jie Jack. "Hofmann rearrangement." In Name Reactions, 290–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01053-8_127.

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