Method for preparing of mono or di-2-substituted cyclopentanone

Details Method for preparing of mono or di-2-substituted cyclopentanone Method for preparing of mono or di-2-substituted cyclopentanone

C - Chemistry, Metallurgy

07

C

C07C 49/395 (2006.01) C07C 45/48 (2006.01) C07C 45/54 (2006.01) C07C 49/657 (2006.01) C07C 51/12 (2006.01) C07C 51/373 (2006.01) C07C 55/02 (2006.01) C07C 59/347 (2006.01)

Patent

CA 2173618

Method for the preparation of mono or di_2-substituted cyclopentanone characterized in that it consists in performing in sequence four stages (a) to (d) which can be successively carried out, if desired, in the same reactor: (a) addition of alkyl acetoacetate to 1,3-butadiene, optionally 2-substituted; (b) the addition product formed is subjected to deacylation, following by an alkaline hydrolysis reaction and acidification to produce a carboxylic monacid having 6 carbon atoms in its main chain; (c) said monacid is subjected to hydroxycarbonylation to produce an alpha , omega -carboxylic diacid having 6 carbon atoms in its mains chain; and (d) said diacid is subjected to cyclizing decarboxylation. The invention is especially intended for the preparation of 2,2-dimethylcyclopentanone.

Method for the preparation of mono or di-2-substituted cyclopentanone characterized in that it consists in performing in sequence four stages (a) to (d) which can be successively carried out, if desired, in the same reactor: (a) addition of alkyl acetoacetate to 1,3-butadiene, optionally 2-substituted; (b) the addition product formed is subjected to deacylation, following by an alkaline hydrolysis reaction and acidification to produce a carboxylic monacid having 6 carbon atoms in its main chain; (c) said monacid is subjected to hydroxycarbonylation to produce an .alpha.,.omega.-carboxylic diacid having 6 carbon atoms in its mains chain; and (d) said diacid is subjected to cyclizing decarboxylation. The invention is especially intended for the preparation of 2,2-dimethylcyclopentanone.

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