The Reaction of Sulfur Dioxide with Thiols Catalyzed by Boron Trifluoride Etherate. Evidence for a Possible Intervention of Dithiosulfite as a Reaction Intermediate
作者:Fuminori Akiyama
DOI:10.1246/bcsj.56.2657
日期:1983.9
The reaction of sulfurdioxide (SO2) with 1-propanethiol (NPT), 2-propanethiol (IPT), or 2-methyl-2-propanethiol (TBT) catalyzed by borontrifluoride ethrate (BF3OEt2) was investigated. The ratios of dialkyl trisulfide to dialkyl disulfide obtained (RSSSR/RSSR) at an early stage of the reaction were larger than 1 for the reaction of TBT and less than 1 for the reaction of NPT or IPT. The reaction of
ABSTRACT A one-pot and efficient synthesis of dialkyl dichalcogenides (S, Se) in aqueous media under catalyst-free conditions using benzylic, allylic and primary halides with elemental sulfur and selenium has been developed. Also, this procedure was extended to preparation of trisulfides and triselenides from secondary and tertiary halides in same condition. In all cases, products can be obtained in good
Simple and green method for synthesis of symmetrical dialkyl disulfides and trisulfides from alkyl halides in water; PMOxT as a sulfur donor
作者:Mohammad Soleiman-Beigi、Fariba Mohammadi
DOI:10.1080/17415993.2016.1253696
日期:2017.3.4
ABSTRACT An environmentally new, mild and efficient method has been developed for the synthesis of dialkyl disulfides and dialkyl trisulfides in aqueous conditions by a reaction between alkyl halides (and tosylate) and potassium-5-methyl-1,3,4-oxadiazole-2-thiolate (PMOxT) as a sulfur transfer reagent. The advantages of this method are that it occurs under mild reaction conditions, it is base free
A smoke suppressant for reducing smoke emission when a flammable organic material is heated above its decomposition temperature or ignited comprises a liquid heterocyclic polysulphide compound having the formula
R - Sx - Z - Sxʹ - Rʹ (I)
where R is an organic group containing 1 to 12 carbon atoms, Rʹ is hydrogen or an organic group containing 1 to 12 carbon atoms, x is at least 2, xʹ is 1 or more when Rʹ is hydrogen and is at least 2 when Rʹ is an organic group and Z is a divalent radical derived from a heterocyclic compound, preferably a sulphur-containing heterocyclic compound such as thiadiazole. The compound (I) may contain dissolved or dispersed elemental sulphur. The smoke suppressant is particularly suitable for use in polyurethane foams.
当易燃有机材料被加热到超过其分解温度或被点燃时,用于减少烟雾排放的烟雾抑制剂包括一种液态杂环多硫化物化合物,其式为 R - Sx - Z - Sxʹ - Rʹ (I) 其中 R 是含有 1 至 12 个碳原子的有机基团,Rʹ 是氢或含有 1 至 12 个碳原子的有机基团,x 至少为 2,当 R ʹ 是氢时,xʹ 为 1 或更多,当 R ʹ 是有机基团时,xʹ 至少为 2,Z 是衍生自杂环化合物的二价基,最好是含硫杂环化合物,例如噻二唑。 该化合物 (I) 可含有溶解或分散的元素硫。 该烟雾抑制剂特别适用于聚氨酯泡沫中。
Industrial Distillation Fractions of Garlic Essential Oil, Design, Synthesis, and Antifungal Activity Evaluation of Aliphatic Substituted Trisulfide Derivatives
Garlic oil has a wide range of biological activities, and its broad-spectrum activity against phytopathogenic fungi still has the potential to be explored. In this study, enzymatic treatment of garlic resulted in an increase of approximately 50 % in the yield of essential oil, a feasible GC-MS analytical program for garlic oil was provided. Vacuum fractionation of the volatile oil and determination