Unexpected cyclization of β-(hydroxymethyl)phosphole into 1-phospha-1,6a-dihydrophosphapentalene: a fused 1,3-butadiene-based luminophore

Abstract

During the planned synthesis of carbon-bridged fused phospholes, an unexpected intramolecular cyclization of β-(hydroxymethyl)phosphole yielded 1-phospha-1,6a-dihydropentalene, besides the expected cyclized product. The solid-state emission of 1-phospha-1,6a-dihydropentalene indicates its potential as a 1,3-butadiene-based solid-state luminophore.