[EN] SYNTHESIS OF DIMETHYL-C17-32-ALKYL SULFONIUM SALTS [FR] SYNTHÈSE DE SELS DE DIMÉTHYL-ALKYLE EN C17-32 SULFONIUM
摘要:
The invention relates to a process for the preparation of a dimethyl-C17-32-alkyl sulfonium salt, preferably a dimethyl-C17-32-alkyl sulfonium halide, more preferably a dimethyl-C17-32-alkyl sulfonium chloride, still more preferably dimethyl octadecyl sulfonium chloride, the process comprising the steps of: providing a mixture of a C17-32-alkyl halide and dimethyl sulfide; and reacting the C17-32-alkyl halide with the dimethyl sulfide.
Chiral sulphur-containing molecules in Langmuir–Blodgett films
作者:Christian Georges、T. John Lewis、J. Patrick Llewellyn、Susanna Salvagno、D. Martin Taylor、Charles J. M. Stirling、Viola Vogel
DOI:10.1039/f19888401531
日期:——
explanation. Attempts at depositing chiral L.B. multilayers of (+)-C18H37SO-p-tolyl were not successful because of crystallite formation on the quartz support. Multilayers of (+)-S-octadecyl cysteine were deposited successfully, albeit with a monolayer of stearic acid interposed every seven monolayers of the chiral compound. No optical rotation was observed in the films.
长直链烷烃链已在链端,链端附近和中链处被含硫基团官能化。已经研究了此类化合物在Langmuir膜中的行为。几个给出了稳定的单分子层,已从中确定了分子面积。与压力-面积(π - A)等温线同时进行的表面电势(ΔV)测量为了解某些化合物的表面行为提供了重要的信息。在压缩,改变了Δ V -一个特征清晰可见,发生在之前以及任何显著变化π -一个曲线。新的证据呈现这里还建议的以前的解读π -甲的行为Ç 10 ħ 21 SO(CH 2)10 CO 2分子取向方面H为不正确,在水副相单层溶解在较高的压力而最可能的解释。由于在石英载体上形成了微晶,因此未成功沉积(+)-C 18 H 37 SO- p-甲苯基手性LB多层膜。(+)- S的多层-十八烷基半胱氨酸已成功沉积,尽管手性化合物的每七个单层插入了一层硬脂酸单层。在膜中未观察到旋光。
Dodecyl-, hexadecyl-, and octadecyl-dimethylsulphonium iodide were found to methylate efficiently various nucleosides, hydroxy aromatic compounds, and thiols at pH 8–11 and 50–70 °C. The optimum conditions and the mechanism of the reaction are discussed briefly in relation to the micellar reaction characteristics.
As a new compound, mixed alkylsulfonium salts of N-phosphonomethylglycine having the formula
wherein R' is selected from the group consisting of long-chain saturated or unsaturated alkyl groups having from 12 to 20 carbon atoms and R2 and R3 are the same or different and are selected from the group consisting of lower alkyl having from 1-3 carbon atoms.