Extremely high stereoselectivity of novel helical ruthenium(II) complexes for photoinduced reduction of racemic-[Co(acac)(3)] (Hacac=pentane-2,4-dione)

被引：12
|
作者：
Ohkubo, K
Fukushima, M
Ohta, H
Usui, S
机构：
[1] Dept. of Appl. Chem. and Biochem., Faculty of Engineering, Kumamoto University
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1996年 / 98卷 / 03期
关键词：
asymmetric photocatalysis; helical ruthenium(II) complex; stereoselective photoreduction; photoinduced kinetic resolution;
D O I：
10.1016/1010-6030(95)04286-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A photocatalyst M(C-3)-Delta-[Ru(menbpy)(3)](2+) (menbpy = 4,4'-bis{(1R,2S,5R)-(-)-methoxycarbonyl}-2,2'-bipyridine; M(C-3) = minus (counterclockwise) helical arrangement along the C-3 symmetry axis) possessing a lang lifetime tau and the low quantum yield of photoracemization Phi(rac) (tau = 1500 ns and Phi(rac) = 4.0 x 10(-6) in EtOH at 298 K) facilitated the asymmetric reduction of racemic Delta,Lambda-[Co(acac)(3)] (Hacac = pentane-2,4-dione) at 298 K in deaerated 90% v/v EtOH-H2O; it exhibited extremely high stereoselectivity with the enantiomer rate ratio k(Delta)/k(Lambda) = 14.79 (in the absence of Hacac) -91.9 (in the presence of Hacac).
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页码：137 / 140
页数：4
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