In order to find novel nonsteroidal compounds possessing an inhibitory activity against delayed-type hypersensitivity (DTH) reactions, we conducted random screening using a picryl chloride (PC)-induced contact hypersensitivity reaction (CHR) in mice, and found compound 1 as a lead compound. Then we synthesized and evaluated an extensive series of 5-carboxamidouracil derivatives focused on both the
An aromatic polyester consisting essentially of p-oxybenzoyl units or the 3-methyl or 3-chloro-derivates thereof, 4,4'-dioxybenzophenone units or the 3-methyl- or 3-chloro- derivatives thereof, terephthaloyl units and optionally 1,4-dioxyphenylene units.
Process for producing acyloxy aromatic carboxylic acid
申请人:CELANESE CORPORATION
公开号:EP0170483A2
公开(公告)日:1986-02-05
Acyloxy aromatic carboxylic acids, e.g., 4-acetoxybenzoic acid, are prepared by oxidizing with oxygen an acyloxy aromatic ketone, e.g., 4-acetoxyacetophenone in the presence of transition metal ions as catalyst and a co-reductant. The acyloxy aromatic ketone may be prepared by acylating a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone, which has the effect of "masking" the hydroxyl group of the ketone in a manner necessary to effect the subsequent transition-metal catalyzed oxidation of the ketone to the acyloxy aromatic carboxyic acid.
Thermotropic copolyester, process for preparing it and its use
申请人:ENIRICERCHE S.p.A.
公开号:EP0347963A2
公开(公告)日:1989-12-27
A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains umits deriving from:
(a) a saturated bicarboxy aliphatic acid;
(b) 4,4′-di-hydroxy-biphenyl;
(c) 4-hydroxybenzoic acid; and
(d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring.
Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics.
Said material can be also used as a reinforcing agent when is mixed, by means fo the usual techniques, with the traditional thermoplastic polymers.
CHALCONE DERIVATIVES AND DRUGS CONTAINING THE SAME
申请人:KOWA CO. LTD.
公开号:EP0902007A1
公开(公告)日:1999-03-17
This invention relates to chalcone derivatives represented by the following formula (1):
wherein A represents a phenyl group, a quinolyl group or the like, W represents a vinylene group or the like, and R1 to R5 each independently represent a carboxyl, cyano, alkyloxycarbonyl or like group, or salts of the chalcone derivatives, and also to drugs containing them as effective ingredients.
These compounds have excellent cys-LT receptor antagonism, and are useful as antiallergic agents or the like.