Molecular structure of 2-chloro-3,5-di-tert-butyl-1,3,2-oxazaphospholene as determined by electron diffraction and ab initio calculations

The diheterophospholene ring of the title compound possesses a P-envelope conformation with the axial orientation of the P–Cl bond, which is very long [r_a = 2.177(6) Å].