Method of making ketals and acetals

Details Method of making ketals and acetals Method of making ketals and acetals

C - Chemistry, Metallurgy

07

D

C07D 263/06 (2006.01) C07D 265/06 (2006.01)

Patent

CA 2668294

The invention concerns a method of preparing a compound of formula (1): (see formula 1) wherein R1, R2 , R3, and R4 are independently hydrogen, a linear alkyl group, a branched alkyl group, a cyclic alkyl group, a linear alkenyl group, a branched alkenyl group, a cyclic alkenyl group or alkenyl group, an aryl group, or alkaryl group having 1 to 18 carbon atoms, optionally comprising one or more heteroatoms or optionally being functionalized when different from hydrogen; R is a linear alkyl group, a branched alkyl group, a cyclic alkyl group, a linear alkenyl group, a branched alkenyl group, a cyclic alkenyl group or alkenyl group, an aryl group, or alkaryl group having 1 to 18 carbon atoms, optionally comprising one or more heteroatoms or optionally being functionalized; and a is 0 or an integer of 1 to 12.

La réaction d'alcools avec des oxocarboxylates pour former des acétals ou des cétals est catalysée par des niveaux faibles de façon inattendue d'acides protiques. Par l'emploi de faibles niveaux de catalyseur acide par comparaison avec des quantités couramment utilisées, la formation rapide d'acétal ou de cétal est facilitée alors que la formation d'esters oxocarboxylates est rendue minimale. En employant encore un excès molaire significatif d'oxocarboxylate conjointement avec un faible niveau de catalyseur acide donne naissance à la formation rapide et propre d'acétals et de cétals à partir d'oxocarboxylate et d'alcools.

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