Process for the preparation of .delta.-oxoacetals

C - Chemistry – Metallurgy – 07 – C

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260/568.5

C07C 47/277 (2006.01) C07C 45/51 (2006.01) C07C 49/255 (2006.01)

Patent

CA 1108646

PRECIS DE LA DIVULGATION: La présente invention concerne un procédé de préparation de .delta.-oxoacétals .beta., Y-éthyléniques consistant à faire réagir en présence d'un acide de Lewis un orthoester d'un alcanol avec un diène-1,3 oxysilane dérivé d'un aldéhyde ou d'une cétone .alpha., .beta.- ou .beta., .gamma.-éthylénique énolisable. Les .delta.-oxoacétals éthyléniques peuvent être utilisés notamment pour la préparation de composés .delta.-dicarbonylés et en particulier de 5 -dialdéhydes.

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