Chiral azetidinone derivatives, and their use as dopes in liquid-crystal mixtures

US5334328A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Scherowsky · Berlin, DE
• Claas Junghans · Berlin, DE
• Anke Kaltbeitzel
• Rainer Wingen · Hattersheim, DE
• Britta Michalski · Berlin, DE

Key dates

• Filing date: Jun 17, 1992
• Grant date: Aug 2, 1994
• Expiry date: Jun 17, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/588
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.