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Below -60 and without catalyst, 1.2-dimethylidenecyclopentane (16), 1,2-dimethylidenecyclohexane (13), 1,2-dimethylidenecycloheptane (17), and 1,2-dimethylidenecyclooctane (18) add to sulfur dioxide in the hetero-Diels-Alder mode, giving the corresponding ...
After treatment with an appropriate base (butyllithium or sodium amide), 2-alkenyltris(2-methoxymethoxyphenyl)phosphonium salts carrying an allyl, crotyl, or prenyl (3-methyl-2-butenyl) side chain condense with satd. or unsatd. aldehydes to give conjugated ...
A review; microstructured reactors are mainly characterized by their very-high surface to vol. ratio compared to traditional chem. reactors. Multichannel microreactors having channel diams. in the order of ten to several hundred micrometers have sp. surfac ...
At low temperature 1-alkoxy-1,3-dienes add to sulfur dioxide activated by a Lewis or Bronstedt acid and generate zwitterionic intermediates that can be quenched by enoxysilanes. The resulting beta,gamma -unsaturated silyl sulfinates can be desilylated and ...
A phosphino,oxazoline P,N-bidentate ligand, 4, contg. 3,5-di-tert-butylphenyl groups was prepd. In the Heck arylation of dihydrofuran, 4 affords higher ee's than either 2 or 3, the unsubstituted and m-dimethylphenyl analogs, resp. Several Pd(0) complexes o ...
Polyethylene block-copolymer films containing negative anhydride groups were used to immobilize TiO2, Fe2O3, and Fe3+ photocatalysts. The kinetics of the mineralization of azo-dye Orange II and chlorophenols on copolymer−TiO2, copolymer−Fe2O3, and copolyme ...
The kinetics of condensation of D218O water vapor on D216O ice was studied in the temp. range 140-220 K. The measurements have been performed in real time using the pulsed valve technique in a low-pressure flow reactor. Ice samples were prepd. by several d ...
A parallel study of the radical copper enzyme galactose oxidase (GOase) and a low mol. wt. analog of the active site was performed with dynamic d. functional and mixed quantum-classical calcns. This combined approach enables a direct comparison of the prop ...
A parallel study of the radical-copper enzyme Galactose Oxidase (GOase) and a low mol. wt. analog of the active site (Wang et. al. , Science 279, 537 (1998)) was performed with dynamical d. functional and mixed quantum-classical (QM/MM) calcns. This combin ...
We have performed ab initio mol. dynamics simulations based on d. functional theory to characterize the structural, electronic, and dynamic properties of the three major isomeric forms of the title compd. In agreement with exptl. results, calcns. with two ...
