Anion relay chemistry: Access to the type II ARC reaction manifold through a fundamentally different reaction pathway exploiting 1-oxa-2-silacyclopentanes and related congeners

Distinctly different: Two 1-oxa-2-silacyclopentenes and a saturated congener have been synthesized and demonstrated to provide access to type II anion relay chemistry (ARC) through a fundamentally new mechanistic pathway. Similar to previous studies, but contrary to initial hypothesis, Brook rearrangement additives (hexamethylphosphoramide and CuI) are necessary to promote Si migration and anion capture.