Dihydropyrannic derivatives, their preparation processes and...

Details Dihydropyrannic derivatives, their preparation processes and... Dihydropyrannic derivatives, their preparation processes and...

C - Chemistry, Metallurgy

07

C

260/395, 260/360

C07C 403/14 (2006.01) C07C 45/60 (2006.01) C07D 309/30 (2006.01)

Patent

CA 2031240

BREVET D'INVENTION DERIVES DIHYDROPYRANNIQUES, LEURS PROCEDES DE PREPARATION ET LEUR UTILISATION RHONE-POULENC SANTE ABREGE La présente invention concerne de nouveaux dérivés pyranniques ainsi que leurs procédés de préparation et leurs utilisations. Ces dérivés sont préparés par condensation du diénolate lithié du prénal avec un aldéhyde ou une cétone. Le dérivé pyrannique préparé à partir du .beta.-ionylidène acétaldéhyde, par traitement en présence d'un catalyseur conduit directement au rétinal.

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