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

Alkylidene complex of tungsten Me3Ge-CH W(NAr)(OCMe2CF3)2 (1) ( Ar = 2 , 6 - Pr 2 i C 6 H 3 ) has been prepared by the reaction of Me3GeCH CH2 with known alkylidene compound But–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 CH2 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.