Cyclodiphosphazanes

Chemistry of Diazaphospholephosphines. 1. Preparation of Substituted 4-(Phosphino)-2,5-dimethyl-2H-1,2,3σ2-diazaphospholes, Bifunctional Phosphines with Dicoordinate and Tricoordinate Phosphorus(III) Centers. Chromium(0) and Molybdenum(0) Difluorophosphine Complexes

“…Treating 2 with N , N -dimethylaminotrimethylsilane was attempted as an alternate route to 3 ; however, no reaction occurred under reasonable conditions even though formation of the aminophosphinodiazaphosphole and trimethylfluorosilane should be favored by at least 20 kJ mol -1 . The reason for the lack of reaction here is not clear as examples are known in which the reaction proceeds as expected. − Cases are also known where a fluorophosphorus compound does not react with aminosilanes, and we surmise that the reduced basicity of the fluorinated phosphine 2 may inhibit reaction through kinetic constraints.…”

“…The reason for the lack of reaction here is not clear as examples are known in which the reaction proceeds as expected. [25][26][27] Cases are also known where a fluorophosphorus compound does not react with aminosilanes, 27 and we surmise that the reduced basicity of the fluorinated phosphine 2 may inhibit reaction through kinetic constraints.…”

Magnetic interactions in chloro-bridged dimers. Structural characterization of aquadichlorobis(2-methylpyridine)copper(II) and bis[dichlorobis(2-methylpyridine)copper(II)]

“…, A 8.464 (4) 8.647 (2) 8.58 (5) b, A 12.552 (4) 10.985 (3) 10.99 (5) c, A 7.345 (2) 8.440 (2) 8.50 (5) a, deg 93. 45 (2) 106.99 (2) 106.6 (10) <3, deg 113.56 (3) 113.88(2) 114.8 (10) y, deg V, A3 99.52 (3) 70.…”

Hétérocycles organiques de l'arsenic. Synthèse d'arsinimines hétérocycliques par la "réaction de Staudinger." Mécanisme de la réaction

“…Les phosphinimines peuvent soit exister sous la forrne monornbre, soit donner par dimtrisation, un cycle diazadiphosphacyclobutane (17). Nous n'avons obtenu une forrne monom k e stable que dans un seul cas (8A).…”