Studies on the Conversions of Diols and Cyclic Ethers. Part 48. Dehydration of alcohols and diols on the action of dimethylsulfoxide
作者:Árpád Molnár、Mihály Bartók
DOI:10.1002/hlca.19810640204
日期:1981.3.18
The transformations of 13 alcohols and 13 diols in the presence of a small amount dimethylsulfoxide (1/16 mol) were studied. Relationships were found between the type of the hydroxy compound and the selectivity of the transformation, and conclusions were drawn regarding the transformation mechanism. The ether formation observed with certain alcohols proceeds via a carbenium cation. The reaction conditions
Neat cinnamyl fluoride, geranyl fluoride, 5-carbomethoxy-3-fluorocyclohexene and parent 3-fluorocyclohexene undergo spontaneous decomposition on contact with borosilicate glass or catalytic quantities of moderately strong acids that consists in polycondensation with elimination of HF initiated by electrophilic abstraction of F−. Acid sensitivity of these allylicfluorides correlates with stability
Acid-catalyzed organic reactions, such as etherification, esterification, acetal synthesis, cleavage, and interconversion, and pinacol rearrangement were carried out in the presence of catalytic amounts of o-benzenedisulfonimide as Bronsted acidcatalyst; the conditions were mild and selective. The catalyst was easily recovered and purified, ready to be used in further reactions, with economic and ecological
Mechanochemical Nucleophilic Substitution of Alcohols via Isouronium Intermediates**
作者:Tatsiana Dalidovich、Jagadeesh Varma Nallaparaju、Tatsiana Shalima、Riina Aav、Dzmitry G. Kananovich
DOI:10.1002/cssc.202102286
日期:2022.2.8
Greener amine synthesis: Nucleophilicsubstitution of alcohols via reactive isouronium salts under mechanochemical one-jar reaction conditions is presented for the first time. The method opens access towards biologically active amines, including active pharmaceutical ingredients.
An efficient method for carbon–nitrogen bond formation between ally silyl ethers and N , N -acyltosylhydrazine was developed under very mild conditions using 2 mol% of mercuric triflate [Hg(OTf) 2 ] as a catalyst. This method does not require the use of any ligand system or supplementary additives and is applicable to the preparation of various N -allylhydrazides with good to excellent yields.
使用 2 mol% 的三氟甲磺酸汞 [Hg(OTf) 2 ] 作为催化剂,在非常温和的条件下开发了一种在烯丙基甲硅烷基醚和 N , N - 酰基甲苯基肼之间形成碳 - 氮键的有效方法。该方法不需要使用任何配体系统或辅助添加剂,适用于制备各种N-烯丙基酰肼,收率良好。