Chiral azetidinone derivatives, and their use as dopes in liquid

Details Chiral azetidinone derivatives, and their use as dopes in liquid Chiral azetidinone derivatives, and their use as dopes in liquid

1992-06-17

1994-08-02

Lovering, Richard D.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

540357, 540361, 540363, C09K 1934, C07D20508

Patent

active

053343280

ABSTRACT:
Azetidinones of the formula I ##STR1## in which, for example, R.sup.1 is an alkyl or alkenyl radical, R.sup.2 and R.sup.3 are hydrogen or an alkyl or alkenyl radical, Z is hydrogen or (pseudo)halogen, A.sup.1, A.sup.2 and A.sup.3 are a ring system, and M is a spacer group, can be added to liquid-crystal mixtures. Even when admixed in small amounts, they cause considerable twist in the cholesteric and smectic C* phase, which can compensate the pitch of another dope or produce a short S.sub.C * pitch.

REFERENCES:
Japanese Journal of Applied Physics, Bd. 27, Nr. 12, 1988, Tokyo, pp. L2241-L2244, H. R. Duball, "Three classes of new chiral dopants: Synthesis and Physical Qualifications as Dopants for Practical FLC-Mixtures".

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