Dimethylsilylene-bridged

Dimethylselenides, bacterial degradation, 12, 610 Dimethylsilyl bridges, in -titanocenes, 4, 619 Dimethylsilylene-bridged -zirconocenes, synthesis, 4, 949 Dimethyl sulfoxide, for water-solubilization, 1, 827 Dinitrogens... 

All the tf// 7-Cp-amido complexes discussed so far are based on the dimethylsilylene-bridged Gp-amido ligation. A significant extension of the constrained-geometry group 4 complexes is the development of the hydrocarbyl-bridged... 

Various bridged boratabenzene zirconium complexes have been synthesized by salt metathesis, including ethylene-bridged bis(A,A-diisopropylaminoboratabenzene)zirconium complexes 1235, dimethylsilylene-bridged bis(A,A-diisopropylaminoboratabenzene)zirconium dichloride 1236, and dimethylmethylene-bridged (cyclopenta-dienyl)(A,A-diisopropylaminoboratabenzene)zirconium complexes 1237.944 As the crystal structures of the dimethyl... 

Soon after the first reports by Ewen and Kaminsky and Brintzinger, it was shown that by changing the two-atom e ylene bridge of 2b to a one-atom dimethylsilylene bridge (complex 4), the molecular weight and isotacticity of the iPP produced were enhanced. A further increase in polymer molecular weight was obtained by 2-methyl substitution of the indenyl ligands (complexes 5 and 6). ... 

The preparation of ethylene- and dimethylsilylene-bridged indenes generally follows the alkylation routes displayed in Scheme 1.12. Thus, in most cases, the reaction of indenyllithium salts with dibro-moethane or dimethyldichlorosilane gives the corresponding bridged bis(indenes) in good yields (Scheme 1.14) 7,8,76-78,so,si,83,86,110 reaction is equally applicable to substituted indenes. ... 

SCHEME 1.14 Synthesis of (a) ethylene-bridged and (b) dimethylsilylene-bridged bis(indenes). 

Menegele, W Diehold, J. Troll, C. Roll, W. Brintzinger, H. H. ansa-Metallocene derivatives. 27. Chiral zirconocene complexes with two dimethylsilylene bridges. Organometallics 1993, 12, 1931-1935. 

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