An image system and surface singularity solutions for potential flow past an elliptical cylinder

The Milne-Thomson circle theorem is extended to give a simplegeneral expression for the image system in an elliptical cylinderintroduced into an otherwise specified unbounded potential flowwhich contains no singularities in the region to be occupiedby the ellipse. This image system is used to obtain an expressionfor the corresponding source-sink surface singularity distributionon the ellipse, thus providing new benchmark test cases forsource-sink solutions as obtained numerically by a panel method.Several typical examples are given to illustrate the generaltheoretical approach.     

Hydrogenation homogene catalysee par les composes de coordination des platinoides : I. Proprietes catalytiques de derives organometalliques de l'iridium

The definition is stated for a catalytic test working at constant total pressure. The hydrogenation of 1-hexene has been studied with organoiridium compounds as catalysts. Of the derivatives [IrCl(cod)PR₃], the compound with PR₃ = tricyclohexylphosphine (PCy₃) has shown an activity and a selectivity superior to those of previously known catalysts.Two kinetic domains are found according to the temperature. Above ?10°C, the reaction is first order in hydrogen, one-third order in catalyst and zero order in 1-hexane. Below ?10°C it is first order in hydrogen, one-half order in catalyst and one-third order in 1-hexane.The optimum ratio PCy₃/Ir is 1 instead of 2, the value commonly found for other phosphine ligands.Other interesting catalysts containing acetato ligands are described.     

A method for the systematic resolution of unbranched α-acetoxyalkyl- and aralkylaldehydes: synthesis of 11R and 11S-hete

It is shown that oxazolidines derived from racemic unbranched α-acetoxyaldehydes and ?-ephedrine have predictable chromatographic mobilities, with the R-isomer always having a higher R_f-value. This resolution has been used to prepare $\text{11R}$ and $\text{11S}$-HETE.