Mass spectral fragmentation of 5- and 6-membered P-heterocycles resulting in oxophosphines (Y?P ?0 )

Synthesis of 1-Amino-2,5-dihydro-1H-phosphole 1-Oxides and Their N-Phosphinoyl Derivatives, Bis(2,5-dihydro-1H-phosphol-1-yl)amine P,P′-Dioxides

“…Dichlorocarbene addition to the double bond of 2,5-dihydro-1H-phosphole oxides afforded 6,6-dichloro-3-phosphabicyclo[3.1.0]hexane 3-oxides that were converted into 1,2dihydrophosphinine oxides by thermolysis. [14][15][16] 1,2-Dihydrophosphinine oxides are versatile intermediates in the preparation of more-and less-saturated phosphinine derivatives. 17,18 P-Heterocycles with a tervalent phosphorus atom may be novel ligands in transition-metal complexes.…”

Remarkable carbene-induced transformation of 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene, P3C3But3, to the 1,2,4-triphosphole, P3C2But2CBut(carbene). Crystal and molecular structure of the planar triphosphole complex [Mo(CO)3(η5-P3C2But2CBut(carbene))] [carbene = C(N(Me)C(Me)=C(Me)N(Me))]

“…In sulfur chemistry, reactions with electrophiles are known to cause six-to five-membered ring contractions in nonaromatic systems with S-S bond formation. 10,11 While ring expansion of arenes 12 and aromatic phosphabenzenes 13,14 are known to occur with carbenes, no ring contractions have been reported to date.…”