97064-86-3

Upstream product

• 82101-81-3 Bromphosphan 
• 123858-37-7 4-bromo-1,3-bis(tert-butyl)-2,2-dimethyl-4-{phenyl(trimethylsilyl)methylenephosphino}-1,3,2,4λ4-diazasilastannetidine 

Relevant academic research and scientific papers

Diphosphabicyclobutanes

Two isomeric diphosphabicyclobutanes (5, 11) are obtained by treatment of the phosphaalkenes X-P=C(Ph)Tms (1a) and X-P=CTms2 (1b) (X = halogen; Tms = trimethylsilyl) with 2, Mg, or Na.Both syntheses proceed by coupling of two phosphaalkene units affording, however, two different diphosphabutadiene intermediates. 4 and 10 readily undergo isomerization reactions to form the diphosphabicyclobutanes.Irradiation of the phosphaalkenes Cp*-P=C(Ph)Tms (12a) and Cp*-P=CTms2 (12b) (Cp* = C5Me5) gives rise to a different reaction pathway.Dimerization of 12a, followed by homolytic cleavage of the Cp*-phosphorus bond and intramolecular recombination produces the butterfly compound 5, whereas homolytic cleavage of the Cp*-element bond in 12b, followed by rearrangement and intermolecular recombination, affords the diphosphabicyclobutane 11.