Synthesis, structures and catalytic properties of germanium-containing tungsten alkylidene complex Me3Ge-CH=W(NAr)(OR)(2) and metallacycle [CH(GeMe3)CH(GeMe3)CH2]W(NAr)(OR)(2)

摘要

Alkylidene complex of tungsten Me3Ge-CH=W(NAr)(OCMe2CF3)(2) (1) (Ar = 2,6-(Pr2C6H3)-C-i) has been prepared by the reaction of Me3GeCH=CH2 with known alkylidene compound Bu'-CH=Mo(NAr)(OCMe2CF3)2 at a molar ratio 1:1. Metallacycle [CH(GeMe3)CH(GeMe3)CH2]W(NAr)(OCMe2CF3)(2) (2) was isolated from the same reaction when twofold excess of Me3GeCH=CH-, was used. The both compounds 1 and 2 were structurally characterized. They were found to have low activity in metathesis of 1-hexene and high activity in ROMP of cyclooctene and norbornene. (c) 2006 Published by Elsevier B.V.