1,4-二氢苯并[ e ] [1,2,4]三嗪-4-基的异构体衍生物中的柱状液晶相的稳定性:核中的构象效应
摘要:
以纯形式和二元混合物形式检查了具有半圆盘分子结构的三种异构的1,3,6-三取代的苯并[ e ] [1,2,4]三嗪-4-基衍生物的液相行为。结果表明,两个楔形的3,4,5-三十二烷氧基苯基和一个Ph基团的取代位置对Col h相稳定性具有显着影响,其范围从73°C到大概-60°C以下。电子和位阻因素的分析表明,楔形取代基的分子间相互作用占主导地位,并且通过其构象行为,它们影响色谱柱核的堆积,从而影响相稳定性。
Transition-metal-catalyzed, directed intermolecular C–Hbond functionalization is synthetically useful but heavily underexplored in multiheteroatom heterocycle synthesis. Herein we report a cobalt catalytic method for the formation of a three-nitrogen-bearing benzotriazine scaffold via the coupling of arylhydrazine and oxadiazolone. This synthetic protocol features a low-cost base metal catalyst, a
3-Methyl-1,2,4-benzotriazine and some of its derivatives were prepared in moderate yields (50–70%) via a reductive cyclization by a PtO2-catalyzed hydrogenation of the corresponding 2-nitrophenylhydrazones of the pyruvic acid. The latter compounds were obtained in yields higher than 90% by reacting 2-nitrophenylhydrazines with sodium pyruvate salt. Three 3-phenyl-1,2,4-benzotriazine compounds were
Stability of a columnar liquid crystalline phase in isomeric derivatives of the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl: Conformational effects in the core
2,4]triazin-4-yl derivatives with the half-disc molecular architecture was examined in the pure form and in binary mixtures. Results indicate that the position of substitution with two wedge-shaped 3,4,5-tridodecyloxyphenyl groups and one Ph group has dramatic impact on the Colh phase stability, which ranges from 73 °C to presumably below −60 °C. Analysis of electronic and steric factors suggests that
以纯形式和二元混合物形式检查了具有半圆盘分子结构的三种异构的1,3,6-三取代的苯并[ e ] [1,2,4]三嗪-4-基衍生物的液相行为。结果表明,两个楔形的3,4,5-三十二烷氧基苯基和一个Ph基团的取代位置对Col h相稳定性具有显着影响,其范围从73°C到大概-60°C以下。电子和位阻因素的分析表明,楔形取代基的分子间相互作用占主导地位,并且通过其构象行为,它们影响色谱柱核的堆积,从而影响相稳定性。