5676-66-4Relevant articles and documents
Synthesis of diphenyl carbonate from CO2, phenoxide, and CCl4 with ZnCl2 as catalyst
Li, Zhenhuan,Qin, Zhangfeng,Zhu, Huaqing,Wang, Jianguo
, p. 784 - 785 (2007/10/03)
Direct synthesis of diphenyl carbonate (DPC) from phenoxide, CO2 and CCl4 in one pot was realized with ZnCl2 as catalyst. Trichloromethyl cation may act on potassium phenyl carbonate, which brings the carbonyl more easily attached on by the phenoxide. Onium salts promote the reaction greatly, especially with phenol and potassium carbonate instead of phenoxide as reactants. Moreover, the substituent on the aromatic ring has significant effects on the selectivity and yield of carbonate. Copyright
CHLORINATING CHARACTERISTICS OF THE COMPLEX OF N,N-DIMETHYLDICHLOROMETHYLENEIMINIUM CHLORIDE WITH CHLORINE
Mironova, D. F.,Stetsyuk, G. A.,Kukhar', V. P.
, p. 2319 - 2323 (2007/10/02)
The chlorinating characteristics of the complex (I) of N,N-dimethyldichloromethyleneiminium chloride with chlorine were studied for the case of its reactions with olefins (1-hexene, cyclohexene, tetrachloroethylene), unsaturated alcohols (allyl alcohol), and phenols (phenol, p-cresol).It was found that the ionic chlorination of the olefins by the complex takes place at high rates and with a high degree of selectivity.With the hydroxy compounds there are parallel reactions, in which the chlorinating characteristics of the complex (I) and the reactivity of the N,N-dimethyldichloromethyleneiminium chloride appear.Chlorination of the phenols by the complex (I) takes place at the ortho position, and this leads to the formation of di(o-chloroacyl) carbonates (with the complex and the phenol in a ratio of 1:2) or o-chloroaryl dimethylcarbamates (with the reagents in a ratio of 1:1).
NOVEL CATALYSIS OF o-NITROPHENYL CARBONATES BY p-DIMETHYLAMINOPYRIDINE
Brunelle, Daniel J.
, p. 1739 - 1742 (2007/10/02)
Transesterification reactions of o-nitrophenyl carbonates have been found to be greatly facilitated by use of p-dialkylaminopyridines as catalysts.A 20-fold rate increase is observed using 0.01 eq. of p-dimethylaminopyridine in place of 2.00 eq. of triethylamine.Such rate enhancement is not observed with p-nitrophenyl carbonates: 2.00 eq. of Et3N causes reaction to occur 8.5 times faster than 0.01 eq. of DMAP.DMAP catalyzed reactions of o-nitrophenyl carbonate have been used to prepare aromatic carbonates at 0 deg C in high yields, and avoid the necessity of using 2 equiv. of base.
