Academic literature on the topic 'Polyènes – Synthèse (chimie)'
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Dissertations / Theses on the topic "Polyènes – Synthèse (chimie)":
Pichon, Christophe. "Valorisation de cyclobutènes : synthèses et utilisations de ligands chiraux, de polyènes et de monomères pour polymérisation par ouverture de cycle par métathèse." Le Mans, 2002. http://cyberdoc.univ-lemans.fr/theses/2002/2002LEMA1001.pdf.
The main contribution of this work is the synthesis of new cyclobutene compounds, and their applications in organic chemistry. The most important part of this work was to elaborate of 12 cyclobutene or cyclobutane ligands Cyclobutene anhydride can be the starting material of their syntheses. In this case, the enzymatic acylation of meso diol was carried out at low temperature. Alternatively some of these ligands can be prepared more easily starting from the cyclobutane diacide wich was subjected to a resolution step. Some of these molecules were used as chiral ligand in asymmetric catalysis. The enantiomeric excesses were up to 89% which showed the interest of these molecules. The second area was the synthesis of 3 dienic monoacetates Then the strategy was applied to the synthesis of trienes by conrotatory thermal ring opening of alkylidcnecyclobutenes. We examined the torquoselectivity of new substituants. Finally, we studied the influence of allylic substituants in ring opening metathesis polymerisation of this type of cyclene. Collaborating with another team, 3 new monomers were prepared and we succeded in preparing an optically active polymer. Throughout this work, we print out the great interest of cyclobutene compound in the field of organic chemistry. We could extend the chiral pool and the knowledge on ring-opening of cvclobutenes either thermally or by metathesis
Gnonlonfoun, Noukpo. "Synthèse du loliolide et de composés apparentés : utilisation de sels stanneux et mercuriques comme agents de cyclisation électrophile." Tours, 1987. http://www.theses.fr/1987TOUR4013.
Christin, Orane. "Synthèse totale de l’énacyloxine IIa, un antibiotique d’origine naturelle au mécanisme d’action original." Electronic Thesis or Diss., Université Paris Cité, 2023. http://www.theses.fr/2023UNIP5197.
Isolated in 1982 by Watanabe et al. from soil bacteria Frateuria sp. W-315, enacyloxin IIa is a polyenic antibiotic displaying a strong activity against both Gram-positive and Gram-negative bacteria as well as a slight activity against fungi. This rather complex polyketide consists of a 23 carbons linear chain bearing 6 stereogenic centers, whose one is chlorinated, alongside a conjugated chlorinated penta-ene attached to a cyclohexane with 3 stereogenic centers. The structural complexity of this target induces a high degree of synthetic difficulty involving the synthesis of the fragile polyene unit or the control of the halogenated carbon stereochemistry. Our retrosynthetic plan features the synthesis of fragments A, B and C prior to their assemblage through esterification and aldol reactions. The synthetic strategy developed for fragment C1-C16 relies on a key Pd(II)-catalyzed alkyne chloroallylation, resulting in the selective formation of the (Z)-vinyl chloride, followed by a Pd(II)/Cu(I)-catalyzed alkyne hydrocarbation of allenes and a final 1,2-elimination step to complete the polyenic chain formation. The synthesis of fragment A C1'-C6' relies on a ring closure metathesis, a Pd(0)-catalyzed carbonylation reaction, and a hydrogenation/isomerization one-pot sequence of the acrylate formed to generate the third stereogenic center. On the other hand, fragment C C17-C23 is obtained through a key L-prolinamide-catalyzed '-chlorination of aldehydes, resulting in the stereoselective formation of the desired chlorinated stereogenic center. Finally, the successful assemblage of fragments B and C was achieved through a diastereoselective Mukaiyama aldol reaction, providing access to the C1-C23 skeleton peculiar to the enacyloxin family. This manuscript also presents initial attempts to assemble fragments A and B
Marchand, Nathalie. "Synthèse et réactivité de polyènones à conjugaison croisée possédant une chiralite planaire." Rennes 1, 1996. http://www.theses.fr/1996REN10115.
Villiers, Pierre. "Synthèse d'un nouveau réactif d'hexavinylogation. Réactions de couplage croisé pallado-catalysées sur le 1,6-dibromohexa-1,3,5-triène." Rouen, 1999. http://www.theses.fr/1999ROUES051.