A novel process for preparing 2-cyclopentenones of the formula: ##STR1## wherein R.sub.1 is hydrogen, alkyl or alkenyl and R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, aryl or aralkyl, which comprises esterifying a mixture of a 3-hydroxy-4-cyclopentenone of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are each as defined above and a 4-hydroxy-2-cyclopentenone of the formulas: ##STR3## wherein R.sub.1 and R.sub.2 are each as defined above with an aliphatic carboxylic acid to give a mixture of the 4-hydroxy-2-cyclopentenone (III) and the cyclopentenone ester of the formula: ##STR4## wherein R.sub.1 and R.sub.2 are each as defined above and R is hydrogen or C.sub.1 -C.sub.4 alkyl and subjecting the resulting mixture to reduction.
一种制备2-
环戊酮的新工艺,其
化学式为:其中R.sub.1为氢、烷基或烯基,R.sub.2为烷基、烯基、炔基、环烷基、芳基或芳基烷基。该工艺包括酯化一种3-羟基-4-
环戊酮的混合物,其
化学式为:其中R.sub.1和R.sub.2如上所定义,以及一种
4-羟基-2-
环戊酮的混合物,其
化学式为:其中R.sub.1和R.sub.2如上所定义,与脂肪族
羧酸反应,得到一种
4-羟基-2-
环戊酮(III)和
化学式为的
环戊酮酯的混合物:其中R.sub.1和R.sub.2如上所定义,R为氢或C.sub.1 -C.sub.4烷基,并将所得混合物进行还原处理。