Four ring esters and ethers

Details Four ring esters and ethers Four ring esters and ethers

1990-03-13

1993-03-02

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 568631, 568647, 560 65, C09K 1930, C07C 6976, C07C 4100

Patent

active

051906929

ABSTRACT:
Four ring esters and ethers of formula I ##STR1## wherein R.sup.1 and R.sup.2 independently from each other are alkyl or alkenyl with up to 9 carbon atoms or such residues wherein one CH.sub.2 group is replaced by oxygen,

REFERENCES:
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patent: 4602851 (1986-07-01), Jenner et al.
patent: 4637897 (1987-01-01), Kelly
patent: 4708441 (1987-11-01), Petrzilka et al.
patent: 4846998 (1989-07-01), Pohl et al.
patent: 4911863 (1990-03-01), Sage et al.
patent: 4943384 (1990-07-01), Sucrow et al.

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