Dearomatization of the heteroarene core proceeds in the absence of any transition metal catalyst via silyl anion addition and subsequent stereoselective β‐elimination. DFT calculations provide insights into the mechanism. Functionalizing C‐X bond cleavage in heteroarenes is rare and generally requires ...
None of them are ideal, but clever mixtures have such a good taste quality that even gourmets can substitute sugar in various food preparations. No calory sweeteners are, in spite of their negative media image, a real success story. Chemistry made it possible....
In conjunction with the DMT Institute for Drivage and Coal-Winning a curving belt conveyor system, which uses conventional components apart from special roller stands in the curve area, was developed. The theoretical principle of this technology is the attainment of a state of equilibrium between ...
The main result of the paper is that R has finite CM type if it dominates the local ring R ' of a simple plane curve singularity in the sense of Arnol'd (i.e. of type A k , D k or E 6 , E 7 , E 8 ). That R dominates R ' means just that R ' RR ' , where R '...
Hilberg in 1971 is used as a scaling function (father wavelet) to construct a biorthogonal wavelet family, we call Hutlets. A realization with perfect reconstruction, multiplier-free quadrature mirror filters is proposed. An application of the Hutlets to pulse amplitude modulated radio control watch...
Male Wistar rats (initial weight 58 g) received in four groups (10 animals per group) 0.0, 10.6, 21.3, and 31.8% glycerol in the dry matter of the diet (groups 1 to 4). The live weight gain of the animals was, after a feeding time of 3 weeks in the groups 1 to 4, 2.01, ...
doi:10.1002/mawe.19750060506Prof. Dr.-Ing. H.-D. SteffensDipl.-Ing. I. D. HendersonDipl.-Ing. U. EchterhoffMaterialwissenschaft Und Werkstofftechnik
Methylated phenyl groups in hexaaryldistannanes cause reversible thermal dissociation R3SnSnR3 ( 1 ) 2 R3Sn路 ( 2 ) only if at least the 2,6-positions are methylated. Further methyl groups enhance this dissociation only when neighbouring these positions and each other, thus causing a buttress...
doi:10.1002/1522-2454(200110)13:5<300::AID-VIPR300>3.0.CO;2-GNo is available for this article.Jitschin, WolfgangJohn Wiley & Sons, Ltd.Vakuum in Forschung Und Praxis