Abstract:
The present invention refers to new air-stable molybdenum alkylidyne catalysts, a process for the preparation thereof and their use for high performance alkyne metathesis.
Abstract:
2-(Halogenated methyl)naphthalenes and 2-naphthylacetonitrile are produced safely and inexpensively with high selectivity in good yield. 2-(Halogenated methyl)naphthalenes are produced by halogenation of 2-methylnaphthalene using a reaction with a halogenating agent under light irradiation, in a solvent selected from a halogenated hydrocarbon, an aliphatic ester and an aliphatic hydrocarbon. The compounds are derived into various pharmaceuticals or their intermediates (for example, 2-naphthylacetonitrile).
Abstract:
Disclosed is a preparation method for triphenylchloromethane, comprising the following steps: adding hydrochloric acid or a mixture of hydrochloric acid and Lewis acid to a mixture of triphenylmethanol and an organic solvent; stirring for reaction; removing the water layer after the completion of reaction to obtain an organic solution containing triphenylchloromethane. In the method, the conversion rate of triphenylmethanol is almost quantitative to be above 99%, and the content of triphenylchloromethane in the product obtained is above 99%. The operation is simple, and no waste gas is generated. Therefore, the method is environmentally friendly and suitable for industrialized production and can achieve better economic benefits.
Abstract:
The present invention provides a direct oxidation method for saturated hydrocarbon bonds in an organic compound. The method allows an organic compound with a saturated hydrocarbon bond to react with an oxidizing reagent in the presence of cerium complex under visible light irradiation, thus oxidizing the saturated hydrocarbon bond to afford an oxidation product. The present reaction only needs to be carried out at room temperature, while the reaction efficiency remains high. In addition, only visible light is required to provide the energy for activation, rendering the present strategy a milder and greener reaction method. The cerium catalyst used in the method is low in cost, simple and efficient, while the oxidizing reagent used is also stable in nature and low in industrial cost, rendering the catalytic system highly practical. Furthermore, environmental pollution caused by heavy transition metals and peroxides can be avoided in such strategy.
Abstract:
Disclosed are a pyrazole compound or a salt thereof, a preparation method therefor, a herbicidal composition and use thereof. The pyrazole compound or a salt thereof has a structure as shown in formula (I):
wherein, R represents
wherein, R', R", and R'" represent hydrogen, C1-C4 alkyl, C1-C4 halogenated alkyl, C1-C4 alkoxy or halogen, R', R", and R'" may be the same or different; R 1 represents C1-C3 alkyl; R 2 represents hydrogen or C1-C4 alkyl; R 3 represents hydrogen or C1-C6 alkyl, optionally substituted phenyl, optionally substituted pyridyl, optionally substituted alkenyl, optionally substituted alkynyl, C1-C6 alkyl carbonyl, C1-C6 alkoxyl carbonyl, C1-C6 alkyl carbonyl methyl, etc. A compound having a pyrazole structure not only has excellent herbicidal effect on barnyard grass, but also is safe to rice in post-emergence application. More surprisingly, it also has good control efficacy on barnyard grass resistant to major herbicides, such as penoxsulam, quinclorac, cyhalofop-butyl, propanil, etc.
Abstract:
The present application relates to a method for photochlorination, and specifically to photochlorination by a photochemical reaction of an aromatic compound with gaseous chlorine so as to prepare a trichloromethyl-substituted benzene, and to a method using bis-(trichloromethyl)-benzene as the trichloromethyl-substituted benzene to prepare by further reaction bis-(chloroformyl)-benzene. Through the control of temperature, illuminance and consumption of gaseous chlorine, the method of this application can greatly improve the purity of trichloromethyl-substituted benzene and further prepare polymer-grade bis-(chloroformyl)-benzene with low cost. The present application also relates to a method for purifying trichloromethyl-substituted benzene, and specifically to a method for purifying trichloromethyl-substituted benzene via molecular distillation. The present application further relates to a photochlorination reactor for use in photochlorination reactions (such as those of the present application).
Abstract:
The present disclosure relates to a process for the halogenation of hydrocarbon. In accordance with the process of the present disclosure a hydrocarbon and a halogen is introduced in a reaction vessel. Light having wavelength in the range of 390 to 780 nm is then passed into the reaction vessel for a time period of 2 to 12 hrs. to obtain a halogenated hydrocarbon. The hydrocarbon is agitated before or after the introduction of the halogen in to the reaction vessel.