1-Piperidino-1-trimethylsilyloxycyclopropane and the corresponding 1-hydroxy-1- piperidinocyclopropane, conveniently prepared from the piperidide of 3-chloropropionic acid, react as cyclopropanone equivalents with various nucleophiles. Use of these derivatives in the formation of pyrroles, pyrrolines and pyrrolizidines is described. The rearrangement of dicyclopropyl ketimines is explored.
