The heterocyclic 2,3-diones 1 and 11 together with Lawesson reagent (LR) afford novel isoindigoide dyes 4 and 12, respectively. 4a can thermally be isomerized into the pyrano[4,3-c]pyrane 6, accompanied by a significant hypsochromic shift which was corroborated by quantum chemical calculations. The phoshporanylidene derivative 13 was obtained via Wittig reaction of 1. All structural assignments were
杂环2,3-二酮1和11以及Lawesson试剂(LR)分别提供了新型的靛蓝
染料4和12。4a可以热异构为
吡喃并[4,3-c]
吡喃6,伴随着显着的变色转变,这通过量子
化学计算得到了证实。通过1的Wittig反应获得了
磷丝亚基衍
生物13。所有结构分配均基于4a和13的X射线研究。