Tetra-tert-butylcyclotetraphosphane, 4

Article abstract of DOI:10.1107/S0567740881006754

C16H36P4, monoclinic, P2₁/c, a=9.391 (1), b=14.029 (2), c=16.854 (2) Angstroem, β=95.80 (1) deg, V=2196 Angstroem³, Z=4, D_o (by flotation in ZnCl2 solution)=1.08, D_c=1.07 Mg m^-3.The central P₄ ring is non-planar with P-P distances of 2.212 (2) Angstroem and P-P-P-P torsion angles of 24.5 deg.The tert-butyl groups are on alternate sides of the ring such that the molecule very nearly possesses 42m symmetry.The final R was 0.037 for the 1981 observed reflections.