Process for preparing alpha-aromatic group substituted alkanoic acids or esters thereof.

摘要

A process for preparing an alpha-aromatic group substituted alkanoic acid or its ester of the general formula <CHEM> wherein Ar represents an aromatic group and R<1> represents a hydrogen atom or a saturated aliphatic group, or Ar and R<1> may form a condensed ring together with the carbon atom to which they are bonded; and R<2> represents a hydrogen atom, an alkyl group, or a hydroxyalkyl group, characterized in that an alpha-sulfonyloxyketone acetal of the general formula <CHEM> wherein R<3> and R<4>, independently from each other, represent an alkyl group. or taken together, represent an alkylene group; R<6> represents a substituted or unsubstituted alkyl group or an aromatic group; and Ar and R<1> are as defined above, is hydrolyred, or treated with an agent having affinity for oxygen; and novel intermediate compounds of the general formula (II) used in aforesaid process.