ON THE STRUCTURAL FEATURES OF THE CHIRAL ORGANOMETALLIC LEWIS-ACID CATALYST (DIBORNACYCLOPENTADIENYL) ZIRCONIUMTRICHLORIDE

被引：25

作者：

ERKER, G ^{[1
]}

SCHAMBERGER, J ^{[1
]}

VANDERZEIJDEN, AAH ^{[1
]}

DEHNICKE, S ^{[1
]}

KRUGER, C ^{[1
]}

GODDARD, R ^{[1
]}

NOLTE, M ^{[1
]}

机构：

[1] MAX PLANCK INST KOHLENFORSCH,D-45470 MULHEIM,GERMANY

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1993年 / 459卷 / 1-2期

关键词：

D O I：

10.1016/0022-328X(93)86061-L

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

2-Bornenyllithium (3) was prepared from camphor by a variant of the Shapiro reaction and then reacted with 0.5 molar equivalents of ethylformate to give the dibornenylcarbinol 4. Subsequent acid-catalyzed cyclization of 4 yielded ''dibornacyclopentadiene'' as a mixture of two diastereoisomers; their deprotonation with n-butyllithium produced a single ''dibornacyclopentadienyllithium'' reagent (6). Reaction of 6 with MCl4 (M = Zr, Hf, Ti) gave the chiral organometallic Lewis-acids ''(diborna-CP)MCl3''. ''(+)-(Dibornacyclopentadienyl)zirconiumtrichloride'' (7a) was characterized by X-ray diffraction. The molecular structure of 7a provides a basis for discussing the stereochemical characteristics of the enantioselective arene hydroxyalkylation process catalyzed by the optically active organometallic Lewis-acid ''(dibornacyclopentadienyl)zirconiumtrichloride''.

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页码：107 / 115

页数：9

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