A methyl ester of hyaluronan in which the carboxyl groups were fully esterified was prepared using trimethylsilyl diazomethane. This derivative, while not depolymerized by hyaluronan lyases or hyaluronan hydrolases, was a substrate for both chondroitin ACI lyase (EC 4.2.2.5) from Flavobacterium heparinum and chondroitin ACII lyase (EC 4.2.2.5) from Arthrobacter aurescens. The major product isol...

Comparative studies on chlorination and methylation reactions have been carried out to afford chloromethyl(methyl)silanes. For chlorination reactions, three types of initiators, viz., azobisisobutyronitrile, benzoyl peroxide and dicumyl peroxide have been studied at different reaction conditions, e.g., solvent, temperature, time duration of reaction and molar ratio of reactants in view to get o...

Abstract Sensitive and reliable analysis of alkylphosphonic acids (APAs) 2-( N,N- dialkylamino)ethanesulfonic (SAs), the degradation products chemical warfare agents (CWAs), is one most important tasks for verification Chemical Weapons Convention (CWC). Unambiguous identification these chemicals required in a variety environmental matrices, including soil water. These with low volatility are ve...

Rh-mediated carbene (co)polymerisation of diazomethane works best in the presence of Rh(III) catalyst precursors, the use of which leads to a significant increase in polymer yield and molecular weight. Chain termination via β-hydride elimination is severely suppressed for these species, although this process does still occur leading to unsaturated chain ends. Subsequent chain walking leading to...

Institut für Organische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-7400 Tübingen Z. Naturforsch. 37b, 1623-1632 (1982); received October 19, 1982 X-ray, Steric Hindrance, C14-Tracer Technique, Triarylmethyl Radical, Diazomethane The structure of the title compound 3, C39H32, obtained for the first time by Schlenk and Bornhardt (1912) from triphenylmethyl (1) and diazomethane (2...