Organosilylalkyl or organosilylalkenyl compounds, process for pr

Details Organosilylalkyl or organosilylalkenyl compounds, process for pr Organosilylalkyl or organosilylalkenyl compounds, process for pr

1992-08-20

1994-09-20

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229963, 25229964, 25229965, 25229966, 25229967, 556400, 556413, 556424, 556427, 556436, 556437, 556438, 556440, 556441, 556445, 556453, 556454, C09K 1934, C09K 1952, C09K 1920, C07F 704

Patent

active

053486846

ABSTRACT:
The novel silylalkyl or silylalkenyl compounds correspond to the general formula (I) ##STR1## Here the symbols A.sup.1, A.sup.2, A.sup.3 denote aromatic or heteroaromatic molecular units such as 1,4-phenylene or pyrimidine-2,5-diyl which are combined via a single bond (for k, m=0) or via functional groups M.sup.1,M.sup.2 such as CO--O or CH.sub.2 --O; j, k, l, m, n are zero or 1 (j+l+n=2 or 3). The radicals R.sup.2, R.sup.3, R.sup.4, R.sup.5 are hydrogen or alkyl/alkenyl, cycloalkyl, and the radicals R.sup.6, R.sup.7, R.sup.8 have a comparable meaning (hydrogen); R.sup.1 is alkyl/alkenyl or one of the substituents known from LC chemistry such as an .alpha.-haloalkanoic radical. In some cases compounds have wide and polymorphous liquid crystalline phases.

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patent: 5277838 (1994-01-01), Haas et al.

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