Compositions – Radioactive compositions – Nuclear reactor fuel
Patent
1987-04-16
1990-02-06
Gron, Teddy S.
Compositions
Radioactive compositions
Nuclear reactor fuel
25229901, 2522995, 25229961, 350350S, 546 1, 546290, 546291, 546292, 546296, 546300, 546301, 546302, 546303, 546326, 546328, 546329, 546330, 546331, 546334, 546335, 546339, 546342, 546346, 546350, 546351, C09K 1934, G02F 113, C07D21326
Patent
active
048984558
ABSTRACT:
There is described compounds of the formula ##STR1## wherein X stands for CH and Y stands for N or X stands for N and Y stands for CH; A.sup.1 and A.sup.2 signify single covalent bonds or one of the groups A.sup.1 and A.sub.2 also signifies trans-1,4-cyclohexylene, cis-4-cyano-trans-1,4-cyclohexylene or 1,4-phenylene optionally substituted with halogen or methyl; ring B represents trans-1,4-cyclohexylene, 1,4-phenylene optionally substituted with halogen or methyl or, when A.sup.2 signifies a single covalent bond, also cis-4-cyano-trans-1,4-cyclohexylene; R.sup.1 denotes an optionally halogen-substituted alkyl or alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC--; R.sup.2 signifies an optionally halogen-substituted alkyl or alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC-- or R.sup.2 on a benzene ring also signifies --NCS, cyano or halogen; with the proviso that R.sup.1 denotes an optionally halogen-substituted alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC-- when R.sup.2 signifies cyano or halogen; and with the proviso that R.sup.1 and/or R.sup.2 has a chiral carbon atom when R.sup.1 and R.sup.2 stand for optionally halogen-substituted alkyl groups in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC--,
as well as liquid crystalline mixtures and their use for electro-optical purposes.
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Buchecker Richard
Germann Alfred
Kelly Stephen
Schadt Martin
Gould George M.
Gron Teddy S.
Hoffmann-La Roche Inc.
Johnston George W.
Leon Bernard S.
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