Beilstein J. Org. Chem.2015,11, 169–173, doi:10.3762/bjoc.11.17
: cycloaddition; phospholes; phosphorus heterocycles; polycyclicphosphines; retro-Diels–Alder reaction; Introduction
Phospholes are weakly aromatic heterocycles and demonstrate rather different properties from those of their S, N and O counterparts [1][2]. Due to low their aromaticity, phospholes are of
cycloaddition reactions, this work presents the opportunity for new polycyclicphosphines.
ORTEP view of 2,3,4,4a,5,6-hexa(p-fluorophenyl)-1-ethyl-1,7,7a-triphospha-4,7-(ethylphosphinidene)indene (2e). Hydrogen atoms are omitted for clarity. Selected bond lengths [Å] and angles [°]: P1–C1 1.850(5); P1–С4 1.923
PDF
Graphical Abstract
Scheme 1:
Synthesis of 1-alkyl-1,2-diphospholes 1a–e.