An ionic liquid catalyzed Friedel–Crafts alkylation reaction of substituted benzenes with CCl4 was developed. The reaction proceeded efficiently under mild conditions, gave corresponding trichloromethylarenes with diversity functional groups in moderate to good yields. The influence of Lewis acidity of ionic liquids on the conversion of the alkylation reaction has been investigated. Notably, the probable
The invention relates to a process for the preparation of trifluoromethylanilines of formula (I)
wherein
R1 is hydrogen, fluorine, chlorine, bromine, methyl, monochloromethyl, dichloromethyl, or formyl, and
R2 is hydrogen, fluorine or chlorine,
with the proviso that when R1 and R2 are both hydrogen, the amino group is para to the trifluoromethyl group, comprising
(a) nitrating a benzotrichloride of formula (II)
wherein R1 and R2 are each as defined for formula (I), thereby forming a nitrobenzotrichloride,
(b) converting the trichloromethyl group of the nitrobenzotrichloride into a trifluoromethyl group by reaction with anhydrous hydrofluoric acid, thereby forming a nitrobenzotrifluoride, and
(c) reducing the nitro groups of the nitrobenzotrifluoride to form a trifluoromethylaniline of formula (I).
METHOD FOR PREPARING LAMORTRIGINE AND ITS INTERMEDIATE 2,3-DICHLOROBENZOYL CHLORIDE
申请人:Van Deynse Dirk
公开号:US20090312544A1
公开(公告)日:2009-12-17
A method for preparing 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine, commonly known as lamotrigine, is disclosed. A method of preparing the intermediate, 2,3-dichlorobenzoyl chloride, by photochlorination of 2,3-dichlorobenzotrichloride followed by hydrolysis is also disclosed. The intermediate may then be used in the preparation of lamotrigine.
A flame-retardant resin composition comprising (A) at least one polymer resin selected from the group consisting of thermoplastic polyesters and thermoplastic polycarbonates and, per 100 parts by weight of the polymer resin, (B) 0.1 to 30 parts by weight, as the weight of the halogen element. of an organic halogen compound, and (C) 0.1 to 20 parts by weight, as the weight of the antimony element, of antimony trioxide treated with an alkoxysilane compound. The composition may further comprise up to 30 parts by weight of an organic acid ester compound and'or up to 200 parts by weight of a filler, per 100 parts by weight of the polymer resin.
A process for preparing 1,2-dichloroethane in high yield with depression of side reactions forming 1,1,2-trichloroethane etc. in considerable amounts, by reacting ethylene with chlorine in 1,2-dichloroethane containing a metal chloride catalyst at 65 to 160°C, which comprises adding to said reaction medium 0.001 wt% or more of at least one aromatic compound selected from the group consisting of benzene hydrocarbons and phenols represented by the following general formula:
(wherein R1, R2 and R3 each represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, or a hydroxy group) and chlorinated products thereof.