Electrochemical Synthesis of Organic Polysulfides from Disulfides by Sulfur Insertion from S
<sub>8</sub>
and an Unexpected Solvent Effect on the Product Distribution
作者:Jan Fährmann、Gerhard Hilt
DOI:10.1002/chem.202101023
日期:2021.8.2
An electrochemical synthesis of organic polysulfides through sulfur insertion from elemental sulfur to disulfides or thiols is introduced. The highly economic, low-sensitive and low-priced reaction gives a mixture of polysulfides, whose distribution can be influenced by the addition of different amounts of carbon disulfide as co-solvent. To describe the variable distribution function of the polysulfides
介绍了通过从元素硫插入硫到二硫化物或硫醇来电化学合成有机多硫化物。这种高度经济、低敏感性和低成本的反应得到多硫化物的混合物,其分布可以通过添加不同量的二硫化碳作为共溶剂来影响。为了描述多硫化物的可变分布函数,引入了一个新参数“多硫化物中吸光度平均硫含量”(SAP),并根据高分子化学中使用的“数均摩尔质量”进行定义。使用不同体积分数的二硫化碳合成各种有机多硫化物,并通过定量13 C NMR 测定每种多硫化物的产率。此外,通过使用两种对称的二硫化物或二硫化物和硫醇作为起始原料,可以获得对称和不对称多硫化物的混合物。
TBAF Promoted Formation of Symmetrical Trisulfides
作者:Slawomir Lach、Dariusz Witt
DOI:10.1002/hc.21129
日期:2014.1
developed a new method for the synthesis of functionalized symmetricaltrisulfides based on (5,5-dimethyl-2-thioxo-1,3,2-dioxa-phosphorin-2-yl)disulfanyl derivatives prepared from readily available 5,5-dimethyl-2-sul-fanyl-2-thioxo-1,3,2-dioxaphosphorinane or bis(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl) disulfide. The symmetricaltrisulfides can be obtained from aliphatic and aromatic thiols and
straightforward preparation of (5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorin-2-yl)disulfanyl derivatives from readily available 5,5-dimethyl-2-sulfanyl-2-thioxo-1,3,2-dioxaphosphorinane or bis(5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl) disulfide. The symmetrical trisulfides can be obtained from aliphatic and aromaticthiols and also l-cysteine derivatives. symmetrical trisulfides -thiols- sulfenyl
Under atmospheric pressure and solvent-free conditions, organic superbase (SB) catalyzed the oxidation of alkanethiols (RSH) to dialkyl disulfides (R2S2) by using sulfur as oxidant was investigated. The results showed that amidines (DBU, DBN) and guanidines (BTMG, MTBD, TMG) exhibited significantly higher catalytic activity than common organic bases. Under the condition of 3.0 molar ratio of RSH/S
研究了在常压、无溶剂条件下,以硫为氧化剂,有机超强碱(SB)催化烷硫醇(RSH)氧化为二烷基二硫醚(R 2 S 2 )。结果表明,脒(DBU、DBN)和胍(BTMG、MTBD、TMG)的催化活性明显高于普通有机碱。在RSH/S摩尔比为3.0(RSH过量50 mol%)的条件下,( n -C 8 H 17 ) 2 S 2的收率可达99%~100%,SB用量为0.1 mol%,收率大于95% ( n -C 8 H 17 ) 2 S 2的产率即使使用 0.001 mol% SB 也可以获得。当RSH/S的摩尔比为2.1(RSH过量5mol%)时,目标产物R 2 S 2 (R=烷基、苯基)的收率仍高于90%。R 2 S 3是唯一的副产物,并且没有生成R 2 S 4 。SB对RSH的去质子化能力明显高于普通有机碱,RS -是催化反应中的关键活性物种。该合成方法具有操作简单、成本低廉的优点,并且适用于20-30
Potassium salts catalyzed oxidative coupling of alkanethiols with sulfur: the effect of solid-liquid phase transfer of crown ether
Potassium salts (KA, A = anion) that catalyzed the oxidative coupling of alkanethiols (RSH) to dialkyl disulfide (R2S2) were investigated by using sulfur as oxidant and 18-crown-6 ether as phase tr...