Va. Naumov et al., Molecular structure of 2-chloro-3,5-di-tert-butyl-1,3,2-oxazaphospholene as determined by electron diffraction and ab initio calculations, MENDELEEV C, (6), 1999, pp. 225-226
The diheterophospholene ring of the title compound possesses a P-envelope c
onformation with the axial orientation of the P-Cl bond, which is very long
[r(a) = 2.177(6) Angstrom].