Synthetic method of oxadiazon intermediate 2,4-dichloro-5-nitrophenol
The invention discloses a synthesis method of an oxadiazon intermediate 2,4-dichloro-5-nitrophenol, which comprises the following steps: reacting 2,4-dichlorophenol with an esterification reagent under the action of a catalyst to generate diphenyl carbona
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Paragraph 0034-0035; 0039-0046
(2020/02/14)
Thermolysis of phenoxyaluminum compounds and formation of PCDD/F and their precursors
Within the study of the formation of chlorinated dioxins and dibenzofurans and their precursors the thermolysis of hexachloroethane over the aluminum melt was investigated. "De novo" synthesis of precursors of PCDD/F was studied in the model system AlCl3/elemental carbon. Totally chlorinated heterocyclic compounds have been detected parallel with the formation of organochlorine compounds. The possibility of inserting oxygen to aluminum organyls was presented. In order to gain more detailed knowledge of the catalytic behaviour of fly ash the chemistry of thermolysis of phenoxy- and chlorophenoxy aluminum compounds at 300°C with the presence and absence of Al2O3 was investigated. Reagent compounds and products of thermolysis were followed by mass spectrometry.
Voncina,Medved,Zerjal
p. 2029 - 2038
(2007/10/03)
NOVEL CATALYSIS OF o-NITROPHENYL CARBONATES BY p-DIMETHYLAMINOPYRIDINE
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.
Brunelle, Daniel J.
p. 1739 - 1742
(2007/10/02)
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