177,008 research outputs found
Selective hydrogenation of PhCH=CHCOMe to the unsaturated alcohol catalysed by [IrH3(PR3)3] (R = alkyl or aryl)
No full textSelective hydrogenation of benzylideneacetone (PhCH=CHCOMe) catalysed by iridiumphosphine systems prepared in situ is reported. Depending on the steric properties of the phosphine employed and the P:lr ratio, different species are formed in solution, as evidenced by n.m.r. spectroscopy. [IrH5(PR3)2] (R = alkyl or aryl) is a catalyst for the hydrogenation of the carbon-carbon double bond, whereas [IrH3(PR3)3] catalyses the reduction of the carbonyl group with a selectivity up to 100%
Effect of Charge Distribution on Selective Hydrogenation of Conjugated Enones Catalyzed by Iridium Complexes
No full textSelective hydrogenation of enones catalyzed by iridium complexe
Hydrogenation of alpha,beta-Unsaturated Aldehydes and Ketones to the Unsaturated Alcohols catalysed by Hydridoiridium Phosphine Complexes
No full textIridium phosphine complexes catalyze the selective hydrogenation of unsaturated aldehydes and ketone
Selective Hydrogenation of Benzylideneacetone catalysed by Iridium Diphosphine Complexes
No full textHydrogenation of benzalacetone is catalyzed by iridium complexe
Selective Hydrogenation of Cinnamic Aldehyde C6H5CH=CHCHO to Unsaturated Alcohol Catalysed by Iridium Phosphine Systems
No full textHydrogenation of cinnamic aldehyde catalyzed by iridium compound
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Asymmetric Catalytic Hydrogenation of-Amino Ketones by Cationic Iridium Complexes
No full textIridium-catalyzed asymmetric hydrogenatio
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Highly Selective Catalytic Hydrogenation of Cyclic Enones
No full textHydrogenation of cyclic enones catalyzed by iridiu
- …
