The first use of a spiranic diamino-nucleophile, 7,11,18,21-tetraoxa-3,15-diazatrispiro[5.2.2.5.2.2]heneicosane, as linker in the synthesis of dendritic melamines, is reported. The chirality of a C(a)4 and/or a C(a)2(b)2 spiranic carbon is discussed and, for the first time, assigned. The nature of exocyclic ligands in aza-positions N-3, -15 leading to versatile types of pseudo-allenic arrangements
据报道,螺环二
氨基亲核试剂7,11,18,21-tetraoxa-3,15-diazatrispiro [5.2.2.5.2.2]庚烯烷在合成树突状
三聚氰胺中作为连接物首次被使用。讨论并首次分配了C(a)4和/或C(a)2(b)2螺碳的手性。讨论了氮杂位置N-3,-15上环外
配体的性质,导致围绕三螺环骨架的伪亚烯烃排列形式多样。当> N–C(X)–↔–N +(C–X −)–(X(O,N)键,显示了螺环中旋转(原)非对映异构和轴向手性之间区别的第一个NMR证据。还观察到了这种立体
化学的意想不到的超分子方面。