Synthesis and structure of 5,6,7,12-tetrahydrodibenz[c,f][1,5]azabismocines
摘要:
Hypervalent organobismuth compounds, 6-tert-butyl-5,6,7,12-tetrahydrodibenz[c,f][1,5]azabismocines, with 13 different substituents on the bismuth atom including halogens, alkyl, alkenyl, alkynyl, aryl, or phenylthio groups have been synthesized. A key compound, 12-chloro-6-tert-butyl-5,6,7,12-tetrahydrodibenz[c,f][1,5]azabismocine, which is a precursor for other azabismocines, has been synthesized by two different procedures; one is based on Akiba's method using 2-bromobenzylbromide as one of the starting materials and the other is a newly developed one using a cheaper starting material, 2-chlorobenzyl chloride. The structures of 12 new bismuth compounds were determined by X-ray diffraction. The eight-membered tetrahydroazabismocine ring has proved to be highly flexible and the hypervalent Bi-N bond distances vary ranging from 2.568(3) to 2.896(5) Angstrom, depending on the electronic nature of the substituents on the bismuth atom. The Bi-N bond distances have good linear relationship against Hammett's sigma(m) constants. (C) 2004 Elsevier B.V. All rights reserved.
Oxidative addition of Bi–C bonds to Pt(0): reaction of Pt(PEt<sub>3</sub>)<sub>3</sub> with cyclic organobismuth compounds
作者:Shigeru Shimada、Xiang-Bo Wang、Masato Tanaka
DOI:10.1039/d0cc07408j
日期:——
The reaction of cyclic organobismuth compounds, 12-phenyl- and 12-chloro-5,6,7,12-tetrahydrodibenz[c,f][1,5]azabismocines, with Pt(PEt3)3 was examined. Oxidativeaddition of the exocyclic Bi–C bond to Pt(0) selectively took place in the reaction of the 12-phenyl derivative. Oxidativeaddition of the exocyclic Bi–Cl bond reversibly took place and was kinetically preferred, while endocyclic Bi–C bond