Push–Pull Stabilization of Parent Monochlorosilylenes

While reaction of
carbene-stabilized disilicon L:SiSi:L
(L: = C­{N­(2,6-iPr2C6H3)­CH}2) (8) with HCl·NC5H5 results in carbene-stabilized Si2Cl2 (2) and substituted 1H-imidazole (9), combination of the corresponding Fe­(CO)4-modified disilicon carbene complex L:SiSi­[Fe­(CO)4]:L (6) with pyridine hydrochloride gives a species
containing two push–pull-stabilized parent monochlorosilylenes
that are bridged by an Fe­(CO)3 unit (7). The
nature of 7 was further elucidated by spectroscopic,
crystallographic, and computational methods. Spectroscopic data suggest
that 7 exists as two diastereoisomers.