167772-04-5Relevant articles and documents
Hypervalent bond formation in halogeno(2-acylphenyl)bismuthanes
Murafuji, Toshihiro,Mutoh, Takanori,Satoh, Kohichi,Tsunenari, Kazumi,Azuma, Nagao,Suzuki, Hitomi
, p. 3848 - 3854 (1995)
Hypervalent bond formation has been found to occur at bismuth as the hypervalent center. The transformation of (2-acetylphenyl)bis(4-methylphenyl)bismuthane (2b) to (2-acetylphenyl)bromo(4-methylphenyl)bismuthane (3b) brings about a noticeable change in the electronic nature of the carbonyl function in the 2-acetylphenyl group, which is sensitively reflected in the IR, 1H, and 13C NMR spectra of compound 3b. These spectral changes may be rationalized in terms of the formation of a hypervalent O-Bi-Br bond through intramolecular coordination of the carbonyl oxygen atom to the bismuth center. X-ray crystallography of 3b has confirmed this interpretation.