Benzotriazoles containing phenyl groups substituted by heteroatoms and compositions stabilized therewith
申请人:——
公开号:US20030004235A1
公开(公告)日:2003-01-02
2H-Benzotriazole UV absorbers substituted at the 3-position and/or the 5-position of the phenyl ring by a phenyl moiety which is substituted by a heteroatom are particularly photostable in automotive coatings, and are of low color and exhibit low volatility in thermoplastic compositions.
A rylene-based polychromophore of the general formula I
in which the variables are each defined as follows:
rylene is a radical of the formula
which has been functionalized by at least one imide group, ester group or amide group and which may additionally be substituted by aryloxy, arylthio, hetaryloxy and/or hetarylthio;
X is a rylenedicarboximide radical which absorbs at a different wavelength from the rylene radical, is bonded to the X radical in the peri-position via Y via a moiety
—Y′-A-Y—,
is bonded to the rylene radical and may likewise be substituted by aryloxy, arylthio, hetaryloxy and/or hetarylthio;
A is a bridging member having at least one aromatic or heteroaromatic radical, the Y or Y and Y′ groups being bonded to the aromatic or heteroaromatic radical;
Y is a moiety
Y′ is a moiety
where the moieties (i) and (ii) may be part of the ester groups of the rylene radical and the moieties (iii) are part of the imide groups of the rylene radical and the moieties (iv) are part of the amide groups of the rylene radical;
R
1
is hydrogen or C
1
-C
18
-alkyl, where the R
1
radicals may be the same or different when they occur repeatedly;
n is 1, 2 or 3;
x is from 1 to 7.
Compounds of the formula I, and liquid-crystalline media, preferably having a nematic phase and negative dielectric anisotropy, comprising
a) one or more compounds of the formula I
and one or more compounds selected from
b) one or more compounds of formula II
and/or
c) one or more compounds selected from compounds of formulae III-1 to III-4 and formula B
Methods for making and using these liquid-crystalline media in electro-optical displays, particularly in active-matrix displays based on the VA, ECB, PALC, FFS or IPS effect and the displays which contain these media. Methods for stabilizing liquid-crystalline media with compounds of formula I, where the liquid-crystalline media comprise one or more compounds of the formula II and one or more compounds selected from compounds of the formulae III-1 to III-4 and formula B.
Provided is a method for producing an aromatic compound, which can produce a particular aromatic compound at high yield and can be industrially utilized. According to the invention, there is provided a method for producing an aromatic compound, including an aromatization reaction which includes reacting an oxime compound represented by Formula (1) with an acylating agent in the presence of a hydroquinone compound and a palladium compound, and thus obtaining an aromatic compound.
PIPERIDINE DERIVATIVES AND LIQUID-CRYSTALLINE MEDIUM
申请人:MERCK PATENT GMBH
公开号:US20180037820A1
公开(公告)日:2018-02-08
Disclosed are compounds of the formula I, liquid-crystalline media comprising the compounds of formula I, and the use of these liquid-crystalline media in liquid-crystal displays.