نتایج جستجو برای: deuterium
تعداد نتایج: 8846 فیلتر نتایج به سال:
Pd-catalyzed intramolecular asymmetric carbopalladation of N-aryl acrylamides followed by reduction of C(sp3 )-Pd intermediate using diboron-water as a hydride source afforded enantioenriched 3,3-disubstituted oxindoles in high yields and enantioselectivities. When heavy water was used as a deuterium donor in combination with bis(catecholato)diboron (Cat2 B2 ), deuterium was incorporated into t...
We report the first direct observation of excited state muon transfer in hydrogen/deuterium mixtures by direct measurement of q1s, the probability that a μp atom, which is initially formed in an excited state, reaches the 1s ground state. The dependence of q1s on deuterium concentration cd was measured for two different densities at cryogenic temperatures using charge coupled devices (CCDs) to ...
Recent highly reproducible results of tritium production by deuterium-deuterium (D-D) fusion from gas/solid-state fusion experiments are discussed in terms of a surface fusion mechanism. Theoretical criteria and experimental conditions for improving and optimizing D-D fusion rates in a gas/solid-state fusion device are described. It is shown that the surface fusion mechanism also provides a pla...
An electromagnetic field is applied on a long-thin Pd wire to test the effect of an electrical potential on the loading of the deuterium gas into the palladium, which was proposed by Del Giudice, De Ninno and their group during ICCF-9. The preliminary experimental results showed that this electromagnetic field triggered not only the loading, but also the “excess heat” because of the deuterium f...
The gold-catalyzed transformation of allenyl acetals into 5-alkylidenecyclopent-2-en-1-ones is described. The outcome of our deuterium labeling experiments supports a 1,4-hydride shift of the resulting allyl cationic intermediates because a complete deuterium transfer is observed. We tested the reaction on various acetal substrates bearing a propargyl acetate, giving 4-methoxy-5-alkylidenecyclo...
The scalar, vector, and tensor components of the (generalized) deuteron electric polarizability are calculated, as well as their logarithmic modifications. Several of these quantities arise in the treatment of the nuclear corrections to the deuterium Lamb shift and the deuterium hyperfine structure. A variety of second-generation potential models are used and a (subjective) error is assigned to...
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