Catalyst acid / base properties regulation to control the selectivity in gas-phase methylation of catechol
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Recently, LTCC (low-temperature co-fired ceramic) technology has increasingly found applications beyond pure electronics, in fields such as microfluidics, sensors and actuators, due to the ease of shaping the tapes in the green (unfired) state. Accurate co ...
The aza-MBH reaction of imines, e.g., I, and beta -naphthyl acrylate in the presence of C-6' modified beta -isocupreidine deriv. (0.1 equiv) and beta -naphthol (0.1 equiv) afforded the corresponding (3S)-aza-MBH adducts, e.g., II, in high yield and excelle ...
The conformation and titrn. curves of weak polyampholytes are examd. using Monte Carlo simulations with screened Coulomb potentials in the Grand Canonical ensemble. Two different types of monomers are considered. Depending on the soln. pH, monomers A are w ...
A series of cobalt and nickel complexes with macrocyclic imine ligands such as difluoroboryldiglyxomime and [14]-Tetraene-N4 were synthesized for electrochem. hydrogen evolution catalysis. The complexes catalyzed the redn. of proton to dihydrogen at potent ...
A review. This review addresses the catalytic reactions performed in microstructured reactors, which are more and more recognized in recent years as a novel approach for chem. and chem. process industry. They are particularly suited for highly exothermic a ...
A Knudsen flow reactor has been used to quantify surface functional groups on aerosols collected in the field. This technique is based on a heterogeneous titration reaction between a probe gas and a specific functional group on the particle surface. In the ...
The first catalytic method for the cyclization of vinyl-cyclopropyl ketones (formal homo-Nazarov reaction) is reported. Starting from activated cyclopropanes, heterocyclic and carbocyclic compounds were obtained under mild conditions using Brønsted acid ca ...
An asym. synthesis of an orthogonally protected gamma -carboxy-L-glutamic acid (L-Gla) is developed featuring a key proline-catalyzed Knoevenagel condensation between Garner's aldehyde and Meldrum's acid. [on SciFinder (R)] ...
Benzylic carbocations, which are easily generated in situ from alcohols or acetates by Brønsted or Lewis acids, undergo selective facial discrimination in diastereoselective reactions (see scheme; FG=functional group). The A values are responsible for the ...
The Diels-Alder reaction has been examd. in room temp. ionic liqs. with high molar concns. of Lewis acids under various conditions. A molar ratio of 10% catalyst gave a large increase in the selectivity and the yield of the reaction. The effect of catalyst ...