Process for producing 2-alkyl-2cyclopentenones

   
   

Industrially advantageous processes for producing a 2-alkyl-2-cyclopentenone in high yields starting from a 2-(1-hydroxyalkyl)cyclopentanone or a 2-alkylidenecyclopentanone, which are obtainable from a cyclopentanone and a carbonyl compound. A 2-(1-hydroxyalkyl)cyclopentanone represented by the following general formula (1): ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 each independently represents hydrogen atom, an alkyl group having 1 to 10 carbon atoms which may have one or more substituents or an aromatic group which may have one or more substituents, and each of (1) R.sup.6 or R.sup.7 with R.sup.3 and (2) R.sup.6 or R.sup.7 with R.sup.4 or R.sup.5 may be together combined to form a ring which may have a double bond) is subjected to dehydrative isomerization in the presence of a bromine compound and/or an iodine compound.

Industrial os processos vantajosos para produzir um 2-alkyl-2-cyclopentenone na elevação rendem partir de um 2-(1-hydroxyalkyl)cyclopentanone ou de um 2-alkylidenecyclopentanone, que são obteníveis de um cyclopentanone e de um composto de carbonyl. Um 2-(1-hydroxyalkyl)cyclopentanone representado pela seguinte fórmula geral (1): ## do ## STR1 (wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 e R.sup.7 cada um representam independentemente o átomo do hidrogênio, um grupo alkyl que tem 1 a 10 átomos de carbono que podem ter um ou mais substituents ou um grupo aromatic que podem ter um ou mais substituents, e cada um (1) de R.sup.6 ou R.sup.7 com R.sup.3 e (2) R.sup.6 ou R.sup.7 com R.sup.4 ou R.sup.5 pode junto ser combinado para dar forma a um anel que possa ter uma ligação dobro) é sujeitado ao isomerization dehydrative na presença de um composto do bromo e/ou de um composto do iodo.

 
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