作者:Ahmad Basheer、Masaaki Mishima、Zvi Rappoport
DOI:10.1002/poc.1611
日期:——
The structures of 2‐substituted malonamides, YCH(CONR1R2)CONR3R4 (Y = Br, SO2Me, CONH2, COMe, and NO2) were investigated. When Y = Br, R1R2 = R3R4 = HEt; Y = SO2Me, R1–R4 = H and for Y = CONH2 or CONHPh, R1–R4 = Me, the structure in solution is that of the amide tautomer. X‐ray crystallography shows solid‐state amide structures for Y = SO2Me or CONH2, R1–R4 = H. Nitromalonamide displays an enol structure
研究了2-取代的丙二酰胺YCH(CONR 1 R 2)CONR 3 R 4(Y = Br,SO 2 Me,CONH 2,COMe和NO 2)的结构。当Y = Br时,R 1 R 2 = R 3 R 4 = HEt。Y = SO 2 Me,R 1 -R 4 = H,对于Y = CONH 2或CONHPh,R 1 -R 4 = Me,溶液中的结构是酰胺互变异构体。X射线晶体学显示Y = SO 2 Me或CONH 2的固态酰胺结构,R 1 -R 4 =H。硝基丙二酰胺在固态下显示具有强氢键的烯醇结构(在100 K时O … O距离= 2.3730Å),并且d(OH)≠d(O … H)。在溶液中观察到明显的对称烯醇,即使在高极性溶剂(如DMSO-d 6)中也占相当大的百分比,但随着溶剂极性的增加,K烯醇值会降低。的Ñ,Ñ ' -二甲基衍生物是以下烯醇。乙酰丙二酰胺在非极性溶剂中显示出乙酰基