Bis-π-cyclopentadienyl-molybdenum or -tungsten compounds containing lithium, magnesium or aluminium and related studies☆

Abstract The dihydrides (π-C 5 H 5 ) 2 MH 2 , where M = Mo or W, react readily with alkyl or aryl derivatives of the metals M′ = lithium, magnesium, or aluminium, forming compounds which, certainly in some cases, and probably in most cases, contain mixed-metal bonds M-M′. Some reactions of these compounds are described, including the reduction of carbon dioxide giving metal carbonyls.