allyl-trimethyl-silane in tetrahydrofuran; diethyl ether under Ar: addn. of 157 mmol allyltrimethylsilane to a stirred suspension of 40.5 mmol WCl6 in diethyl ether at room temperature; stirring for 90 min; pptn.; filtration; cooling on an ice-bath; slow addn. of tetrahydrofuran with stirring;; warming to room temperature; crystallization; filtration after 90 min; washing with diethyl ether; drying under vac.; elem. anal.;;
