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Sterically protected thermally stable 1,2,3-selenadiphosphirane and diselenoxophosphorane were isolated from the reaction of E-bis-(2,4,6-tri-t-butylphenyl) diphosphene with elemental selenium.

E and Z-P-α- (t-Butyldimethylsilyloxy)benzylidene(2,4 ,6-tri-t-butylphenyl)phosphines were isolated as stable compounds.

The diphosphene ArP=PAr (Ar = 2,4,6-But3C6H2) reacts with elemental sulphur to give the stable monosulphide ArP(S)=PAr (2) whose structure was confirmed by an X-ray analysis; when treated with hexamethylphosphorous triamide, (2) reverts to the starting diphosphene but thermal and photochemical isomerisation of (2) gives the thiadiphosphirane ArP-S-PAr.