24473-06-1Relevant articles and documents
Synthesis of Vicinal Quaternary All-Carbon Centers via Acid-catalyzed Cycloisomerization of Neopentylic Epoxides
Schmid, Matthias,Sokol, Kevin R.,Wein, Lukas A.,Torres Venegas, Sofia,Meisenbichler, Christina,Wurst, Klaus,Podewitz, Maren,Magauer, Thomas
supporting information, p. 6526 - 6531 (2020/09/02)
We report our studies on the development of a catalytic cycloisomerization of 2,2-disubstituted neopentylic epoxides to produce highly substituted tetralins and chromanes. Termination of the sequence occurs via Friedel-Crafts-type alkylation of the remote (hetero)arene linker. The transformation is efficiently promoted by sulfuric acid and proceeds best in 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as the solvent. Variation of the substitution pattern provided detailed insights into the migration tendencies and revealed a competing disproportionation pathway of dihydronaphthalenes.
Preparation method of climbazole
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Paragraph 0055; 0056; 0057; 0059; 0060, (2018/04/03)
The invention discloses a preparation method of climbazole. According to the method, toluene, chloroetherketone, imidazole and a catalyst, serving as raw materials, react under 100 DEG C to 110 DEG Cfor 4 hours while the temperature is kept, and then the climbazole with the purity being up to 99 percent is prepared by methods, such as crystallization, purification, alkaline wash and recrystallization. Through a lot of experiments, the invention screens out the best climbazole preparation method, the whole process design is reasonable, the process is easy and efficient to operate, in particular, the best reaction conditions screened out, which include catalyst variety, reaction solvent, reaction temperature, reaction time and steps, such as crude reaction of methylbenzene and the climbazole, and alkaline wash thereof, can greatly increase reaction yield (up to 92 percent or above), side reaction is reduced, the reaction rate is increased, the production cost is greatly reduced, and therefore the preparation method of the climbazole has a good application prospect.
Phototransformation of triadimefon on glass and soil surfaces
Nag,Dureja
, p. 247 - 252 (2007/10/03)
Photodegradation of triadimefon has been studied on glass and soil surfaces. A number of photoproducts have been isolated and characterised by NMR, IR and MS. Photolysis resulted in considerable amounts of 1-(4- chlorophenoxymethyl)-1,2,4-triazole, 1-(4-chlorophenoxy)-2,2-dimethyl-1- (1,2,4-triazol-1-yl)propane, 1-(1,2,4-triazol-1-yl)-3,3-dimethylbutan-2-one and 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-ol. Rates of photodegradation on glass and soil surfaces under UV and sunlight followed first-order kinetics with a significant correlation coefficient. Photodegradation was greater on alluvial soil than on laterite soil.