Monolithic Neat Graphene Oxide Aerogel for Efficient Catalysis of S → O Acetyl Migration
摘要:
Graphene oxide (GO) is highly attractive for catalysis because of its large specific surface area and rich chemical structures. However, it has generally been used as a catalyst carrier. Here, we designed a three-dimensional monolith of neat GO aerogel as a fixed bed carbocatalyst used in the reaction of S -> O acetyl migration for the synthesis of thiol compounds, showing the merits of ultrafast catalytic speed (5-8 h), high selectivity (100%), high yields (near 100%), easy isolation of products, and long -life recyclability (>18 times). Particularly, we achieved for the first time thiol compounds containing functional groups of halogen and hydroxyl, which cannot be synthesized using other currently reported catalysts Control experiments demonstrated that the efficient catalysis mechanism is mainly attributed to the protonic functional groups, ultralarge size, and unpaired electrons of GO, as well as the "cage effect" at nanoscale confined spaces of aerogel cells
Diastereoselectivity in the Diels-Alder reactions of thio aldehydes
作者:Edwin. Vedejs、J. S. Stults、R. G. Wilde
DOI:10.1021/ja00224a033
日期:1988.8
La reaction de Diels-Alder de thioaldehydes avec le cyclopentadiene produit preferentiellement l'isomere endo. La selectivite la plus elevee est obtenue avec les thioaldehydes RCHS ou R est un groupe alkyle encombrant tel que t-butyl ou isopropyl
La 反应 de Diels-Alder de thioaldehydes avec le cyclopentadiene produitpreferentiellement l'isomere end。La selectivite la plus elevee est obtenue avec les 硫醛 RCHS ou Rest un groupe 烷基化 tel que t-丁基 ou 异丙基
A new synthetic route for the preparation of β-acyloxy mercaptans via the addition of thioacids to epoxides
作者:Mohammad Abbasi
DOI:10.1016/j.tetlet.2012.03.045
日期:2012.5
A newsynthetic route for the preparation of S-benzylated β-acyloxy mercaptans starting from the one-pot reaction of thioacids and epoxides using a silica gel/Et3N combined catalyst is described. The thiol functionality in the crude product is then protected via benzylation and the corresponding thioethers are isolated after chromatography.
描述了一种新的合成路线,该路线用于使用硅胶/ Et 3 N组合催化剂从硫代酸和环氧化物的一锅反应开始制备S-苄基化β-酰氧基硫醇。然后通过苄基化作用保护粗产物中的硫醇官能度,并在色谱分离后分离出相应的硫醚。