Herein we demonstrate the synthesis of a helicene‐based imidazolium salt. The salt was prepared by starting from racemic 2‐methyl[6]helicene, which undergoes radical bromination to yield 2‐(bromomethyl)[6]helicene. Subsequent treatment with 1‐butylimidazole leads to the corresponding salt 1‐butyl‐3‐(2‐methyl[6]helicenyl)‐imidazolium bromide. The prepared salt was subsequently characterized by using
The synthesis of eight alkyl substituted hexahelicene derivatives by photodehydrocyclization is described.
描述了通过光脱氢环化反应合成八个烷基取代的六亚庚烯衍生物。
Expeditious synthesis of helicenes using an improved protocol of photocyclodehydrogenation of stilbenes
作者:Harish R. Talele、Anju R. Chaudhary、Parthiv R. Patel、Ashutosh V. Bedekar
DOI:10.3998/ark.5550190.0012.902
日期:——
developed for photodehydrocyclization of stilbenes for the synthesis of phenanthrenes and helicenes. This procedure involves the use of THF as a scavenger of hydriodicacid produced during iodine mediated photodehydrocyclization. The use of THF is advantageous due to its higher boiling point, lower cost and easy availability as compared to propylene oxide. The method is applied to synthesize a number