Ultraviolet radiation resistance; outdoor use; synthesis
公开/公告号：
US7396487 B2
公开/公告日期：
Jul 8, 2008
被引量：
摘要：
A compound of formula (I): where R 1 is alkyl or alkenyl, Y 1 and Y 2 are independently selected from oxygen or sulphur, n is an integer of from 1 to 5, A is an optionally substituted phenyl or an optionally substituted cycloalkyl ring, X is a direct bond, a C 1-4 alkylene, a C 2-4 alkenylene, an acetylene, —CO(O)— or a group of sub-formula (i): where X 1 and X 2 are independently selected from a direct bond, a C 1-4 alkylene, a C 2-4 alkenylene, an acetylene, —CO(O)— and R 2 , R 3 and R 4 are independently selected from hydrogen, halo or cyano, provided that no more than one of R 2 , R 3 and R 4 is hydrogen. These compounds have a high dipole moment and may be used as dopants in liquid crystal mixtures.
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