Patent ID: 7973171

Claim:
A process for the preparation of organo-oxazaborolidines of the structural formula (6) comprising the steps of a) reacting an 1,2-aminoalcohol of the formula (5) HNR 4 —CR 5 R 6 CR 7 R 8 —OH (5) wherein R 4 to R 8 is hydrogen, C 1 -C 20 alkyl, C 6 -C 14 aryl, C 7 -C 24 aralkyl, C 7 -C 24 alkaryl, substituted C 1 -C 20 alkyl or the two groups R 4 and R 5 together are a divalent group selected from the group consisting of —CH 2 CH 2 —, —CH(CH 3 )CH 2 —, —CH 2 CH 2 CH 2 —, —CH(CH 3 )CH(CH 3 )—, —CH(CH 2 CH 3 )CH 2 —, —C(CH 3 ) 2 C(CH 3 ) 2 —, —CH 2 C(CH 3 )2CH2— to form with the —NH—CR 6 — moiety a cyclic structure, with a dialkoxyorganoborane (3) of the formula R 1 —B(OR 2 ) 2 , wherein R 1 is C 1 -C 20 alkyl, C 3 -C 10 cycloalkyl, C 6 -C 14 aryl, C 7 -C 24 aralkyl, C 7 -C 24 alkaryl, C 2 -C 20 alkenyl, C 5 -C 15 cycloalkenyl, C 2 -C 20 alkynyl, CH 2 SiMe 3 , substituted C 1 -C 20 alkyl and R 2 is C 1 -C 20 alkyl or the two R 2 groups in compound (3) together with the BO 2 — moiety form a cyclic structure of the formula with the divalent group R 3 selected from the group consisting of —CH 2 CH 2 —, —CH(CH 3 )CH 2 —, —CH 2 CH 2 CH 2 —, —CH(CH 3 )CH(CH 3 )—, —CH(CH 2 CH 3 )CH 2 —, —C(CH 3 ) 2 C(CH 3 ) 2 —, —CH 2 C(CH 3 ) 2 CH 2 —, —(CH 2 ) 6 —, ortho-C 6 H 4 or ortho-C 6 H 3 alkyl, and b) heating the reaction mixture to complete the ring closure reaction and to distill off the formed alcohol.