Treatment of various organic halides with phosphinic acid (hypophosphorous acid) in aqueous ethanol in the presence of a radical initiator and a base gave the corresponding reduced products in high yields. Addition of a base is indispensable for the reduction of halides by phosphinic acid. Allylic ether of o-iodophenol or 2-haloalkanal allylic acetal underwent radical cyclization under the same conditions
Radical Deoxygenation of Alcohols<i>via</i>Their<i>S</i>-Methyl Dithiocarbonate Derivatives with Di-<i>n</i>-butylphosphine Oxide as Hydrogen Atom Donor
作者:Doo Ok Jang、Dae Hyan Cho、Derek H. R. Barton
DOI:10.1055/s-1998-1582
日期:1998.1
Various S-methyl dithiocarbonates of tertiary and secondary alcohols are readily deoxygenated in high isolated yields by radical deoxygenation with di-n-butylphosphine oxide and various radical initiators in boiling dioxane. Primary alcohols react similarly in boiling xylenes.
Aminopyridine-Borane Complexes as Hydrogen Atom Donor Reagents: Reaction Mechanism and Substrate Selectivity
作者:Florian Barth、Florian Achrainer、Alexander M. Pütz、Hendrik Zipse
DOI:10.1002/chem.201702469
日期:2017.9.27
Alternative for tinhydrides: The crucial choice of initiators and reaction conditions for Lewis base borane mediated radical chain reduction reactions has been investigated in detail. An inverted selectivity was found for the reduction of iodides versus xanthates as compared to tinhydride reagents.
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