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Full-Text Articles in Physical Sciences and Mathematics
I. Studies On The Organocatalytic Formation Of Quaternary Stereocenters. Ii. Studies On The Claisen Rearrangement As A Route To Quaternary Stereocenters. Iii. Asymmetric Synthesis Of Aldehydes Bearing Quaternary Carbon Centers Via The Decarboxylative Asymmetric Allylic Alkylation, Eduardo Alberch
Theses and Dissertations
The asymmetric synthesis of all carbon quaternary stereocenters poses a particular challenge due to the steric congestion inherent in the formation of such centers and has been the object of intense research these last 20-30 years. However, the amount of literature for the synthesis of aldehydes bearing quaternary stereocenters via enolate type chemistry is much more limited due to problems associated with the alkylation of such substrates including such types as Cannizzaro and Tischenko related reactions or self aldol condensations. The formation of aldehydes with quaternary stereocenters via use of enolate equivalents such as the DAAA (decarboxylative asymmetric allylic alkylation) …
New Bimetallic Iridium Cluster Carbonyl Complexes, Mingwei Chen
New Bimetallic Iridium Cluster Carbonyl Complexes, Mingwei Chen
Theses and Dissertations
Platinum group metal derived bimetallic clusters have been used as precursors to nanoscale catalysts which have been proven to be more effective than their monometallic counterparts. Iridium is a platinum group metal and its applications in catalysis continue to grow. To take advantages of synergies between mixed-metals, we modified iridium clusters with other metal ligands like tin, germanium, and group IB (gold, silver, copper) etc. and obtained a fairly large amount of new iridium derived bimetallic clusters which could be precursors to catalysts with superior properties than that available nowadays. The reaction of Ir4(CO)12 with Ph3SnOH in the presence of …