Dehydrogenation of N ‐Heterocyclic Compounds Using H 2 O 2 and Mediated by Polar Solvents

Enantioselective formal [2+2] cycloaddition of ketenes with nitroso compounds catalyzed by N-heterocyclic carbenes.

Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [2+2] cycloaddition reaction of alkyl(aryl)ketenes and nitroso compounds to give the corresponding 1,2-oxazetidin-3-ones in moderate to good yields with high enantioselectivities. Reductive ring-opening of the oxazetidinones give the corresponding α-hydroxy acid derivatives in good yields.

MEASUREMENT OF D 2 O IN WATER USING 2 H ( γ , n ) 1 H REACTION

Utilization of Photodisintegration reaction of Deuterium, H(γ,n)H, is a precise technique for determining the percentage of H in tritiated and natural water. The Na(n,γ)Na reaction is a suitable γ-source for producing the H(γ,n)H reaction. Tehran Research Reactor was used as a neutron source for producing Na isotopes. The BF3 detectors were used to detect the neutron emission of H2 content of w...

formation from H 2 O ¿ mediated by the core - excitation - induced nuclear motion in H 2

A. Hiraya, K. Nobusada, M. Simon, K. Okada, T. Tokushima, Y. Senba, H. Yoshida, K. Kamimori, H. Okumura, Y. Shimizu, A.-L. Thomas, P. Millie, I. Koyano, and K. Ueda* Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima 739-8526, Japan Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan LURE, Batiment 209d, Université Pari...

O + + H 2 O „ + M ... \ H 5 O 2 + „ + M ...

Tandem ammonia borane dehydrogenation/alkene hydrogenation mediated by [Pd(NHC)(PR3)] (NHC = N-heterocyclic carbene) catalysts.

[Pd(NHC)(PR(3))] complexes were shown to be active catalysts in the dehydrogenation of ammonia borane and the subsequent hydrogenation of unsaturated compounds at very low catalyst loadings (0.05 mol% for some substrates).