P. Pertici, Fabio D'Arata, C. Rosini
May 31, 1996
Citations
0
Influential Citations
13
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract New cationic rhodium(I) and iridium(I) complexes [M(dienexdiamine)]BF 4 containing chiral C 2 -symmetric diamines [M = rhodium; diamine = 2,2′-diamino-1,1′-binaphthyl (BNDA), diene = cycloocta-1,5-diene (COD), 1a , bicyclo[2,2,l]hepta-2,5-diene (NBD), 1b , hexa-1,5-diene (HEX), 1c ; diamine = N,N′-dimethyl-2,2′-diamino-1,1′-binaphthyl (DMBNDA), diene = COD, 1d . M = iridium; diamine = BNDA, diene = COD, 2a ; diamine = DMBNDA, diene = COD, 2b ] have been prepared by the reaction of [MCl(diene)] 2 with AgBF 4 and further treatment with the diamine. Using N,N,N′,N′-tetramethyl-2,2′-diamino-1,l′-binaphtyl (TMBNDA), no cationic complex was obtained. With the exception of the complex 1c , complexes 1 and 2 are stable in solution under inert atmosphere. Acetonitrile removes bonded DMBNDA but not BNDA from the metal; KOH removes both the diamines but not the diene. Complexes 1a , 1b , and 2a , containing (+)( R )-BNDA, catalyze the enantioselective hydrogenation of ( Z )-α-acetamidocinnamic acid to acetamidodihydrocinnamic acid (o.p. = 9%; room temperature; hydrogen pressure, 35 atm).