The m-terphenyl isocyanides CNAr(Mes2) and CNAr(Dipp2) support five-coordinate, isocyanide/carbonyl monoanions of manganese. For CNAr(Dipp2), a bis-isocyanide anion is available that is remarkably well behaved upon reaction with electrophiles. Most notable is the formation of an unprecedented chloride-substituted metallostannylene.
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Stewart et al. (2010) studied this question.
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