A. F. Abdel-Magied, M. Patil, A. Singh
Jul 1, 2015
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0
Influential Citations
6
Citations
Journal
Journal of Cluster Science
Abstract
Ten rhenium carbonyl complexes—[Re(H)(CO)3(1a)], [Re3(µ-H)3(CO)10(1a)], [Re2(CO)9(2a)], [Re2(CO)8(2a)], [Re2(CO)9(2b)], [{Re2(CO)9}2(2b)], [Re2(CO)8(2b)], [Re2(CO)8(1b)], [Re2(µ-H)2(CO)6(2b)] and [Re3(µ-H)3(CO)11(2b)]—containing different bidentate chiral phosphine ligands of the Josiphos (1a, 1b) and Walphos (2a, 2b) families have been synthesized and fully characterized (1a: (R)-1-{(SP)-2-[Bis[3,5-bis(trifluoromethyl)phenyl]phosphino]ferrocenyl}ethyldi(3,5-xylyl)phosphine, 1b: (R)-1-{(SP)-2-[Di(2-furyl)phosphino]ferrocenyl}ethyldi-tert-butylphosphine, 2a: (R)-1-{(RP)-2-[2-[Bis(4-methoxy-3,5-dimethylphenyl)phosphino]phenyl]ferrocenyl}ethylbis[3,5-bis(trifluoromethyl)phenyl]phosphine and 2b: (R)-1-{(RP)-2-[2-(Diphenylphosphino)phenyl]ferrocenyl}ethyldicyclohexylphosphine). The phosphine-substituted clusters were tested for hydrogenation of tiglic acid [trans-2-methyl-2-butenoic acid]. The catalytic reactions gave reasonable conversion rates (15–88 %) under relatively mild conditions but relatively moderate enantiomeric excesses (8–57 %) were observed. The crystal structures of [ReH(CO)3(1a)], [Re2(CO)9(2a)], [{Re2(CO)9}2(2b)] and [Re2(µ-H)2(CO)6(2b)] are presented.