Abstract
The X-ray determination of a tungsten based complex allowed to definitively assign its structure and chemical formula to W(OC
6H
3PhC
6H
4)(OAr)(=CHC(CH
3)
3)Cl with Ar
=
2,6-Ph
2C
6H
3. This complex is a catalytic system which displays high metathesis activity and high stereoselectivity even for bulky functional olefins.