Synthesis and physical properties of novel liquid crystals containing 2,3-difluorophenyl and 1,3-dioxane units
摘要:
我们合成了三个系列的液晶材料:2-(2,3-二氟-4-烷氧基苯基)-5-(4-烷基苯基)-1,3-二氧杂环(m,On-DFPD)、2-(2,3-二氟-4-烷氧基苯基)-5-(2-氟-4-烷基苯基)-1、3-二氧杂环戊烷(m,On-DFPFPD)和 2-(2,3-二氟-4-烷氧基苯基)-5-(2,3-二氟-4-烷基苯基)-1,3-二氧杂环戊烷(m,On-DFPDFPD)。通过偏振光学显微镜和差示扫描量热法观察和测量了它们的中间形态特性。还测定了一些目标化合物的介电各向异性(Δε)和双折射(Δn)。这些化合物中的大多数都表现出具有负介电各向异性(Δε)和低双折射(Δn)的宽温度范围共晶 A 相和/或宽温度范围向列相。
Synthesis and physical properties of novel liquid crystals containing 2,3-difluorophenyl and 1,3-dioxane units
摘要:
我们合成了三个系列的液晶材料:2-(2,3-二氟-4-烷氧基苯基)-5-(4-烷基苯基)-1,3-二氧杂环(m,On-DFPD)、2-(2,3-二氟-4-烷氧基苯基)-5-(2-氟-4-烷基苯基)-1、3-二氧杂环戊烷(m,On-DFPFPD)和 2-(2,3-二氟-4-烷氧基苯基)-5-(2,3-二氟-4-烷基苯基)-1,3-二氧杂环戊烷(m,On-DFPDFPD)。通过偏振光学显微镜和差示扫描量热法观察和测量了它们的中间形态特性。还测定了一些目标化合物的介电各向异性(Δε)和双折射(Δn)。这些化合物中的大多数都表现出具有负介电各向异性(Δε)和低双折射(Δn)的宽温度范围共晶 A 相和/或宽温度范围向列相。
electrochemical imidation provides a complementary approach to giving distinct imideproducts compared with previous acyloxylation products. This protocol exhibits good site selectivity and broad substrate generality. Moreover, the utility of the OCR-mediated protocol was extended to the electrochemical oxidation of silane, and its robustness was also highlighted by the imidation of complex substrates, which