S-Acylation of aliphatic and aromatic thiols with carboxylic acids and their esters over solid acid catalysts in the gas phase at temperatures above 200°C
作者:Sayoko Nagashima、Hitomi Yamazaki、Kentaro Kudo、Satoshi Kamiguchi、Teiji Chihara
DOI:10.1016/j.apcata.2013.06.011
日期:2013.8
Benzenethiol is reacted with acetic acid in a hydrogen stream over [(Mo6Cl8)Cl4(H2O)2]·6H2O. Catalytic activity of the clusters appears above 200 °C, yielding S-phenyl thioacetate. The selectivity is 98% at 300 °C. Niobium, tantalum, and tungsten halide clusters with the same octahedral metal framework also catalyze the reaction. Benzoic acid and aliphatic carboxylic acids afford the corresponding S-phenyl
苯硫醇用乙酸在氢气流中在[(反应的Mo 6氯8)氯4(H 2 O)2 ]·6H 2 O.催化簇出现在200℃以上的活性,得到小号-苯基硫代乙酸酯。在300°C下的选择性为98%。具有相同八面体金属骨架的铌,钽和卤化钨簇也催化该反应。苯甲酸和脂族羧酸通过与苯硫醇反应得到相应的S-苯基碳硫盐。脂肪族硫醇也被S-酰化以产生相应的S-烷基硫代碳酸盐。当羧酸酯与苯硫醇在[(Nb 6 Cl 12)Cl 2(H 2 O)4 ]·4H 2 O上于450°C应用于反应时,该酯的空间不受阻碍的部分被并入产物中:S选择性地获得-苯基硫代乙酸酯或甲基苯基硫。通过热活化在簇状配合物上形成的布朗斯台德酸位点是催化剂的活性位点。因此,在200°C以上稳定的固体酸(例如二氧化硅-氧化铝,沸石和杂多酸)也会催化这些反应。