Patent ID: 7601667

Claim:
A sulfonate catalyst represented by general formula (1) and used for a hydrogenation reaction: wherein R 1 and R 2 may be the same or different and each represent an alkyl group, a phenyl group, a naphthyl group, or a cycloalkyl group, which may be substituted, or a part of an alicyclic ring formed by bonding of R 1 and R 2 ; R 3 represents an alkyl group, a phenyl group, a naphthyl group, or camphor which may be substituted; R 4 represents a hydrogen atom or an alkyl group; R 5 represents an alkyl group, a phenyl group, a naphthyl group, or camphor which may be substituted; Ar is bonded to M 1 through a π bond and represents benzene which may be substituted or a cyclopentadienyl group which may be substituted; M 1 represents ruthenium, rhodium, or iridium; and * represents a chiral carbon.