화학공학소재연구정보센터
Inorganic Chemistry, Vol.41, No.24, 6493-6499, 2002
Unexpected formation of an azetidine-carborane derivative by dehydration of N-(1,12-dicarba-closo-dodecaboran-1-yl)formamide. The first X-ray structure of a 2,3-Bis(imino)azetidine
Efforts to dehydrate (1,12-dicarba-closo-dodecaboran(12)-1-yl)formamide (a = 6.685(2) Angstrom, b = 12.877(4) Angstrom, c = 12.547(4) Angstrom, alpha = gamma = 90degrees, beta = 90.724(11)degrees, V = 1080.8(6) Angstrom(3), Z = 4) resulted in the formation of a series of unexpected products. Addition of the Burgess reagent to the formamide, for example, led to the isolation of the corresponding methyl carbarnate (a = 11.529(8) Angstrom, b = 11.529(8) Angstrom, c = 11.402(12) Angstrom, alpha = beta = gamma = 90degrees, V = 1516(2) Angstrom(3), Z = 4), while treatment with triphosgene, a well-known dehydrating agent, resulted in the formation of a highly unusual 2,3-bis(p-carboranylimino)azetidine derivative. This particular compound, in the presence of Re(l), was hydrolyzed to give the corresponding amide, which is the first example of a 2,3-bis(imino)azetidine that has been characterized crystallographically (a = 38.496(13) Angstrom, b = 11.920(4) Angstrom, c = 27.523(10) Angstrom, beta 127.050(5)degrees, V = 10079(6) Angstrom(3), Z = 8).