157772-74-2Relevant articles and documents
Reaction of Methanol with Diphenylantimony(V) Trihalides: Crystal Structure of 2
Bamgboye, T. Tunde,Begley, Michael J.,Southerington, I. Gary,Sowerby, D. Bryan
, p. 1983 - 1986 (1994)
A re-examination of the reaction between diphenylantimony trichloride and methanol showed that the initial product is a methanol adduct of the monomethoxide, SbPh2Cl2(OMe), rather than the oxide (SbPh2Cl2)2O, which is a hydrolysis product formed during recrystallisation.The corresponding tribromide, and the mixed halides, SbPh2Br(3-n)Cln, where n=1 or 2, react similarly with methanol, losing a bromine atom to give solvated monomethoxy products.X-Ray diffraction analysis revealed that SbPh2Br2(OMe) crystallises as a centrosymmetric dimer, incorporating two molecules of methanol, which are attached via strong hydrogen bonds to the oxygen bonds to the oxygen atoms of the methoxy groups.Co-ordination of the methanol oxygen to a symmetry-related antimony atom completes the distorted-octahedral co-ordination about antimony and forms a central eight-atom ring system in the chair conformation.Two unusual features are the similarity of the two Sb-O distances , even though the former is formally a normal ? bond and the latter a donor linkage, and the presence of a weak ?-arene...H-C hydrogen bond, which probably accounts for the orthogonality of the phenyl groups at antimony.
