Trifluoromethyl ethers R-OCF3 are easily synthesized from the corresponding dithiocarbonates R-OCS2Me (R = aryl or primary alkyl) by a reagent system consisting of 70% HF/pyridine and an N-halo imide. When the reaction is applied to R-OCS2Me wherein R = secondary alkyl, tertiary alkyl, or benzylic group, fluorination leading to the corresponding alkyl fluorides R-F is achieved, whereas a combination
An Efficient, One-Pot, Triton-B Catalyzed Synthesis of O-Alkyl-S-methyl Dithiocarbonates
作者:Devdutt Chaturvedi、Suprabhat Ray
DOI:10.1007/s00706-006-0514-0
日期:2006.9
A novel process for the one-stepconversion of a variety of primary and secondary alcohols into their O -alkyl- S -methyl dithiocarbonates using methyl iodide catalyzed by the Triton-B/CS2 system was developed. Thus, O -alkyl- S -methyl dithiocarbonates were obtained in very good to excellent yields. This protocol is mild and efficient compared to other methods.
Superoxide Ion–Promoted Facile One-Pot Synthesis of <i>O</i>-Alkyl-<i>S</i>-methyl Dithiocarbonates from Alcohol Under Mild Reaction Conditions
作者:Satish Kumar Singh、Krishna Nand Singh
DOI:10.1080/10426507.2010.482545
日期:2010.12.30
Abstract A new, mild, and efficient protocol for the one-pot synthesis of O-alkyl-S-methyl dithiocarbonates (xanthates) has been described in reasonably good yields from a variety of alcohols employing carbon disulfide and methyl iodide using superoxide ion at room temperature. GRAPHICAL ABSTRACT
A new ionic liquid [bdmim][F] has been prepared and fully characterized. Its potential as a fluoride source for the desulfurization–fluorination process has been evaluated with success. The carbon–sulfur double bond of xanthates and thiocarbonates has been difluorinated to give rise to small libraries of halogenated ketals and thioketals.
The reagent consisting of 70% HFâpy (py = pyridine) and a
halonium oxidant converts RâOCS
2
Me into either
RâOCF
3
(R = primary) or RâF (R = secondary,
tertiary or benzylic) whereas the 50% HFâpy system converts
RâOCS
2
Me (R = secondary) into
RâOCF
3
.