We have developed a protocol for the NaHSO3‐promoted esterification of sulfonyl hydrazides with alcohols for the synthesis of sulfinicesters. Various sulfonyl hydrazides could be converted to the corresponding sulfinicesters in good to high yields. The merits of this protocol include mild transition‐metal‐free reaction conditions, an inexpensive and available reagent, and operational simplicity.
NMR of terminal oxygen. 6—17O NMR of the SO ‘double bond’: Derivatives of arylsulphinic and arylsulphonic acids
作者:Hans Dahn、Vien Van Toan、My-Ngoc Ung-Truong
DOI:10.1002/mrc.1260290907
日期:1991.9
oxygen atoms in esters, anions and amides of substituted arenesulphinic acids and in esters and amides of substituted arenesulphonic acids were measured. The signals of the terminal O appear close to those of the bridge O. Compared with carbonyl O, terminal SO shows (a) a lower sensitivity to the electronic influences of geminal groups, (b) only a low sensitivity to arene ring substituents and (c) small
测量了取代芳烃磺酸的酯、阴离子和酰胺以及取代芳烃磺酸的酯和酰胺中末端氧原子的 17O NMR 谱。末端 O 的信号看起来接近桥 O 的信号。 与羰基 O 相比,末端 SO 显示 (a) 对孪晶基团的电子影响的敏感性较低,(b) 对芳烃环取代基的敏感性较低(c) 小的溶剂效应。根据 π 键特性讨论 C 键和 S 键 O 之间的差异。Dy3+ 与甲基芳烃亚磺酸盐中的 O 端发生络合。
[EN] INHIBITOR CONTAINING BICYCLIC DERIVATIVE, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] INHIBITEUR CONTENANT UN DÉRIVÉ BICYCLIQUE, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION<br/>[ZH] 含二并环类衍生物抑制剂、其制备方法和应用
synthesis of sulfinic esters and sulfonic esters from sulfonyl hydrazides was developed. Alkyl sulfinic esters were synthesized by treating sulfonyl hydrazides with trialkyl orthoformate in a DMF solvent at a constant current of 5 mA and then optimizing the reaction conditions. Conversely, alkyl sulfonic esters were exclusively obtained when the reaction was conducted in alkyl alcohol solvents at a constant