Fluorous dimethylthiocarbamate (FDMTC) protecting groups for alcohols

A novel three-component reaction between isocyanides, alcohols or thiols and elemental sulfur: a mild, catalyst-free approach towards O-thiocarbamates and dithiocarbamates

A new multicomponent reaction has been developed between isocyanides, sulfur and alcohols or thiols under mild reaction conditions to afford O-thiocarbamates and dithiocarbamates in moderate to good yields. The one-pot reaction cascade involves the formation of an isothiocyanate intermediate, thus a catalyst-free synthesis of isothiocyanates, as valuable building blocks from isocyanides and sulfur is proposed, as well. The synthetic procedure suits the demand of a modern organic chemist, as it tolerates a wide range of functional groups, it is atom economic and easily scalable.

Synthesis and Properties of 1,2,3,4-Butanetetracarboxylic Acid Type Gemini Surfactants with Semifluoroalkyl Chain as Hydrophobic Group

Two kinds of 1,2,3,4-butanetetracarboxylic acid type gemini surfactants having semifluoroalkyl groups (Rf-(CH2)n-; Rf = C8F17, n = 2,3,4,5,6,8,11) as diester of 2,3-bis-COOH and 1,4-bis-COOH were prepared from 1,2,3,6-tetrahydrophthalic anhydride as the key material. Their surface properties were studied by surface tension and surface pressure-area (π–A) measurements. Semifluoroalkylated geminis showed excellent surface tension re-ducing ability, but the values of the critical micelle concentration (CMC) and γCMC remained nearly unaffected by the methylene chain length. From the zero-pressure molecular areas of semifluoro-alkylated geminis and the compression modulus analysis, it was clarified that semifluoroalkylated gemini surfactants having short methylene chains would form more rigid monolayers than those having long methylene chains. But, there were not very large differences in surface properties between two geminis having the same methylene chain length.