Hydrogen rearrangement in the mass spectra of (E)-1-alkylsulfonyl-2-phenylethenes

A novel McLafferty-type rearrangement has been found to be the most facile fragmentation of (E)-1-alkylsulfonyl-2-phenylethenes and the migratory aptitudes for different kinds of hydrogen involved has been qualitatively estimated as benzylic ～tertiary>secondary>primary.     

Evaluation of a rapid semi-quantitative analysis approach using inductively coupled plasma optical emission spectrometry with axial viewing

This work describes a rapid screening procedure for simultaneous determination of multiple elements by inductively coupled plasma optical emission spectrometry with axial viewing. The process requires no calibration reference solutions, and therefore requires a shorter analysis time per sample. The “Rapid Quant for Axial” worksheet contains stored calibration functions that are not adjusted between analyses. These functions were applied to the analysis of standard reference materials to demonstrate the effectiveness of the screening tool. Quantitative recoveries were obtained for most elements in a variety of biological materials. Aluminum, Cu, Mn, P, and Zn were determined in spinach leaves, for example, with errors ranging from − 45% (Al) to + 23% (Cu). A simulation of the worksheet procedure was also tested. With this technique, a single user-specific, multi-element reference solution was used to prepare a new set of calibration parameters to replace those stored in the worksheet. This procedure proved to be useful for sample screening when the analytes of interest were not present in the original calibration file, or when their concentrations differed significantly from those previously stored.     

ENERGY TRANSFER FROM ENZYMICALLY-GENERATED TRIPLET SPECIES TO ACCEPTORS IN MICELLES

Abstract— Electronically excited triplet species generated during the peroxidase catalyzed aerobic oxidation of appropriate substrates efficiently elicit fluorescence from acceptors in micelles, as shown with 9, 10-dibromoanthracene and chlorophyll solubilized by various surfactants. In the case of 9, 10-dibromoanthracene excited by triplet acetone, phosphorescence also can be detected near O₂ depletion.
The significant implications of this study are that micelle-solubilized chlorophyll is an excellent detector of enzyme-generated triplet carbonyl species, as confirmed with several systems, and that the use of micelles make it possible to extend 'photobiochemistry without light' to other photobiologically important, yet water insoluble acceptors.     

A Convenient Regiospecific Syntheses of (E)-1-Alkanesulfonyl- and (E)-1-Arylsulfonyl-2-Phenylethenes

(E)-1-Alkanesulfonyl- and (E)-1-arylsulfonyl-2-phenylethenes (styryl sulfones) were obtained from good to excellent yields by the base-catalyzed elimination of the corresponding β-chlorosulfones. The latter were obtained, respectively, by additions of the alkanesulfonyl- and the arylsulfonyl chlorides to styrene under the catalytic action of copper chlorides.     

A holomorphic characterization of compact sets in Banach spaces

An extension of Lempert’s result about non approximability by entire functions of analytic functions on some open subsets of ?_∞ is obtained for Banach spaces having a bounding non relatively compact set.We also prove that subsets A that are bounding for analytic functions defined in any of its neighborhoodswhose boundary lies at positive distance from A are relatively compact.