Patent ID: 8008508

Claim:
An organocatalyst of formula (I), wherein R 1 is —H, —OH, —O—Si(R 4 )(R 5 )(R 6 ) or C 1-6 alkoxy, in which R 4 , R 5 and R 6 are identical or different and independently selected from the group consisting of C 1-6 alkyl; phenyl and phenyl substituted with C 1-6 alkyl; and X 1 is different from X 2 , wherein: X 1 is —S—; X 2 is —CH 2 —; and R 2 is —OH or ═O, or X 1 is X 2 is —CH 2 —; and R 2 is —OH or ═O.