Abstract Epoxide ringopening with thioacetic acid and thiobenzoic acid was investigated in the presence of water under catalyst-free conditions. This green and simple process gave an excellent yield. With simple decanting, the products were obtained in high purity and on a large scale. In this process, alkyl halide and ester cleavage were not observed.
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
Cossar,B.C.; Reynolds,D.D., Journal of Heterocyclic Chemistry, 1965, vol. 2, p. 430 - 440
作者:Cossar,B.C.、Reynolds,D.D.
DOI:——
日期:——
MATTAY J.; DITTMER CH., J. ORG. CHEM., 51,(1986) N 10, 1894-1897
作者:MATTAY J.、 DITTMER CH.
DOI:——
日期:——
[EN] REINFORCED RUBBER COMPOSITION FOR TIRES<br/>[FR] COMPOSITION DE CAOUTCHOUC RENFORCEE POUR PNEUMATIQUE
申请人:MICHELIN & CIE
公开号:WO2017216485A1
公开(公告)日:2017-12-21
L'invention concerne une composition de caoutchouc à base d'au moins un élastomère diénique, une charge renforçante et un système de réticulation, caractérisée en ce que la composition comprend à titre de charge renforçante du nitrure de bore hexagonal ayant une surface spécifique BET supérieure ou égale à 10m2/g avec un taux allant de 30 à 350 parties pour cent parties d'élastomère et au moins un agent de couplage capable de lier le nitrure de bore hexagonal à l'élastomère diénique, ledit agent de couplage étant un polysulfure comprenant au moins un hétérocycle à 3 maillons.