Abstract
The phosphatriafulvenes 3a,b, accessible from the cyclopropenone 1 and the lithium phosphides 2, possess inverse electron density as indicated by structure B; this can also be deduced from ab initio calculations. In accord with the electronic structure, methyllithium attacks at a carbon atom of the three-membered ring (to 4 5 ), carboxylic acid chlorides effect P -acylation (to 6), and dimethyl acetylenedicarboxylate inserts into the P/Si bond (to 8).
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