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After a partial deactivation, g-alumina (g-Al2O3) is a good catalyst for selective methylation of 1,2-benzenediol at 260-310 Deg. The main products are the desired 3-methyl-1,2-benzenediol and 2-methoxyphenol, which may be converted in another step into 3- ...
The conversion to more environmentally friendly refrigerants is of prime importance for refrigeration and air-conditioning industries. A first option for the substitution of the fluids which use was banned could be natural refrigerants, such as CO2, or HFC ...
The ion pair of the stereolabile C3-symmetric, i+o proton complex [1⋅H]+ of diaza-macropentacycle 1 and the configurationally stable Δ-TRISPHAT ([Δ-3]−) anion exists in the form of two diastereomers, namely, [Δ-(1⋅H)][Δ-3] and [Λ-(1⋅H)][Δ-3], the ratio of ...
Recent analyses of ice core methane concentrations suggested that methane emissions from wetlands were the primary driver for prehistoric changes in atmospheric methane. However, these interpretations conflict as to the location of wetlands, magnitude of e ...
An extensive database has been collected for the evaporation of two hydrofluorocarbon refrigerants (HFC- 134a and the zeotropic mixture HFC- 407C) and the natural refrigerant ammonia (R-717). A model to predict the onset of nucleate boiling has been succes ...
Selective demethylation of the title compd. (I, R = Me) with BCl3 or AlCl3 was described. E.g., treating I (R = Me) with BCl3 in CH2Cl2 at 0 Deg gave 98% I (R = H). [on SciFinder (R)] ...
A novel process named SunCHem has been proposed to produce methane via catalytic hydrothermal gasification of microalgae [1-3]. The process is innovative because it is designed as a closed-cycle system with respect to water, nutrients and some of the CO2, ...
The oxidation of organic and inorganic compounds during ozonation can occur via ozone or OH radicals or a combination thereof. Ozone is an electrophile with a high selectivity. The reactions of ozone with cc inorganic compounds are typically fast and occur ...
In chirped spectroscopy, the phase dispersion in NMR was removed by refocusing the magnetization to form an echo. The method by which this was obtained is described. Chirped spectra of a mixt. of CHCl3, CH2Cl2, acetone, cyclohexane, and dioxane was obtaine ...