Highly efficient syntheses of 3-aryl-2-cycloalken-1-ones and an evaluation of their liquid crystalline properties
摘要:
Cycloalkenones are shown to be mesogens and can be synthesised in near quantitative yields by a convergent palladium(0)-catalysed cross-coupling strategy; a 2-methyl group induces a change of phase from smectic to nematic. (C) 2003 Elsevier Science Ltd. All rights reserved.
luminescence dyes based on pyrene and anthracene derivatives (see figure) are synthesized for liquidcrystaldyelasers. The threshold value of one of the pyrene derivatives is as low as 1/20 that of the commonly used DCM in cholestericliquidcrystal (CLC) distributed feedback lasers. Good optical properties such as luminous efficiency and solubility in CLCs are important factors for realizing a low threshold