Patent ID: 7262320

Claim:
A process for the production of a 3,3-dimethyl-2-formylcyclopropanecarboxylic acid compound of formula (2): wherein R is hydrogen, alkyl which may be substituted with a substituent(s) which are halogen atoms, alkoxy groups, aryloxy groups or aralkyloxy groups, aryl which may be substituted with a substituent(s) which are the above alkyl, alkoxy, aryloxy or aralkyloxy, or aralkyl which are composed of the above alkyl groups and the above aryl groups, which process comprises reacting a 3,3-dimethyl-2(2-methyl-1-propenyl)cyclopropanecarboxylic acid compound of formula (1): wherein R is as defined above, with a periodic acid compound in the presence of a ruthenium compound, wherein an iodic acid compound produced as a by-product in the reaction of the 3,3-dimethyl-2-(2-methyl-1-propenyl)cyclopropanecarboxylic acid compound of formula (1) and the periodic acid compound is converted into and recovered as a periodic acid compound, and the recovered periodic acid compound is reused in the above reaction.