Iron-Catalyzed Arene C–H Amidation Using Functionalized Hydroxyl Amines at Room Temperature
作者:A. V. G. Prasanthi、Samiyara Begum、Hemant Kumar Srivastava、Sandip Kumar Tiwari、Ritesh Singh
DOI:10.1021/acscatal.8b02939
日期:2018.9.7
Herein, we report Fe(III)(TPP)Cl as an effective catalyst for promoting arene C–H amidation throughintramolecular cyclization of N-tosyloxyarylcarbamate substrates. The reaction proceeds via nitrene (outer sphere pathway) C(sp2)–H insertion to yield benzoxazolones under external-oxidant-free conditions at ambient temperature. The method is operationally simple and scalable with high-functional-group
Cross-linking hydrocarbon unsaturated polymer with
申请人:Imperial Chemical Industries Limited
公开号:US04094863A1
公开(公告)日:1978-06-13
A process for the cross-linking or chain-extension of hydrocarbon polymers which contain ethylenically unsaturated groups which comprises forming an intimate mixture of the polymer with a mono-sulphonyloxycarbamate of the formula: A -- O -- CO -- NH -- O -- SO.sub.2 R (1) wherein A is an alkyl group, a cycloalkyl group, an alkenyl group, a substituted alkyl group, a substituted aryl group or a heterocyclic group, and R is an optionally substituted alkyl or aryl group. The process is useful for natural and synthetic rubbers. The rate and extent of cross linking may be modified by the additives such as tertiary amines or conventional rubber additives e.g. tetramethyl and zinc diethyl dithiocarbamates, which contain tertiary amino groups.