Crystal and molecular structure of trans-3,4-dihydro-2,3,4-triphenyl-5-phenylmethyl-2H-1,2,3-diazaphosphole 3-oxide

摘要: The crystal and molecular structure of the first reported example a new five-membered cyclic diazaphospholene oxide was solved by X-ray crystallographic techniques. This compound crystallizes in space group P with unit-cell dimensions a= 5.815(2), b= 9.688(4), c= 20.207(9)A, α= 95.47(6), β= 95.04(4), γ= 89.32(4)°, Z= 2. ring is an irregular almost planar pentagon. geometry about phosphorus atom that distorted tetrahedron angles ranging from 91 to 118°. formation trigonal bipyramidal phosphorane intermediate addition nucleophiles at face opposite P–N bond involves relatively small additional bond-angle deformations: this factor may explain reactivity heterocyclic system toward nucleophiles.