The intramolecularly bridged N,N′-azelaoylindigo (3) and N,N′-sebacoylindigo (4) have been synthesized from indigo and the corresponding dichloride. The intermolecularly bridged N′,N″-sebacoylbis(N-acetylindigo) (5) has been synthesized from N-acetylindigo and sebacoyl dichloride. The relative rates of the cis-to-trans thermal isomerization of 3, 4, and 5, compared with that of N,N′-diacetylindigo (1c), were as follows: 3, 0.77; 4, 3.9; 5, 1.4; 1c, 1.0.
由靛蓝和相应的二
氯化物合成了分子内桥接的 N,N′-壬二酰基靛蓝 (3) 和 N,N′-癸二酰基靛蓝 (4)。分子间桥接的 N′,N″-sebacoylbis(N-乙酰靛蓝)(5)是由 N-乙酰靛蓝和
癸二酸二
氯化物合成的。与 N,N′-
二乙酰基靛蓝(1c)相比,3、4 和 5 的顺式-反式热异构化的相对速率如下:3, 0.77; 4, 3.9; 5, 1.4; 1c, 1.0.