Heteroallenes group

Eichler, Barrett, and West, Robert, Chemistry of Group 14 Heteroallenes. 46 1... 

The first stable group 14 heteroallene, a l-stannaketenimine (99), was reported by Griitzmacher et al. in 1992." Compound 99 was synthesized in 9 % yield by adding diarylstannylenc 97 and mesityl isocyanide 98 in hexane (Eq. (12)). The bonding in 99 can be described as a stannylene-isocyanide adduct rather than a... 

One other study of group 14 heteroallenes involving transition metals was reported in 1995. Jones et al. described the isolation of a ruthenium complex of a 1-silaallene (132—Scheme 32). The 1-silaallene also interacts with a hydrogen atom as well as the ruthenium metal center. Jones et al. describe this view... 

The structures of two group 14 heteroallenes that are complexed to other atoms have been determined—a ruthenium complex of a 1-silaallene (132a) and a... 

Although it is not a group 14 heteroallene, arsaphosphaallene Mes As=C=PMes (+299..S ppm) over-emphasizes the point that the central carbons of heteroallenes are greatly deshielded. For reference, l-phosphaallene Mes P=C=CPh2 has a central carbon shift of +2.17.6 ppm and 1,-1-diphosphaallene Mes P=C=PMes has a shift of +276.2 ppm. 

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