作者:H. W. Schramm、F. Belaj
DOI:10.1007/bf00810471
日期:1992.3
Arylbiguanides 2a - e react with benzoin (1) at the pH of the base to two different products. 1 undergoes in presence of the base 2a-e oxidation to benzil and benzoic acid, which reacts fast with the arylbiguanides 2a-e to yield N-[4-(arylamino)-6-phenyl-1,3,5-triazine-2-yl]benzamides 3a - d. After lowering the pH of the reaction mixture, the bases 2b - e react with benzil to yield 2-[1-aryl-5-oxo-4,4-diphenyl-2-imidazoline-2-yl]guanidine 4b - e. The mechanism of the formation is discussed. The structure of 4b was established from a single crystal x-ray structure analysis. The analysis was carried out at 100 K: C23H21N5O, M(r) = 383.5, monoclinic, C 2/c, a = 15.842(6), b = 8.419(3), c = 30.223(10) angstrom, beta = 98.44(3)-degrees, V = 3987.3(9) angstrom 3, Z = 8,d(x) = 1.277 g/cm3, mu = 0.81 cm-1 R = 5.89%, R(w) = 4.97% (1537 observations, 233 parameters).