Comparative study of the vicinal functionalization of olefins with 2:1 bromide/bromate and iodide/iodate reagents
作者:Manoj K. Agrawal、Subbarayappa Adimurthy、Bishwajit Ganguly、Pushpito K. Ghosh
DOI:10.1016/j.tet.2009.01.095
日期:2009.4
halohydrins, halo methyl ethers, and halo acetates from olefins using 2:1 Br−/BrO3− and I−/IO3− reagents. In many cases both reagents afforded products selectively in high yields. The highest halogen atom efficiencies attained were 97% and 93% for Br−/BrO3− and I−/IO3−, respectively. Of the two reagents, I−/IO3− was established to be the preferred reagent for vicinal functionalization of linear alkenes and
β-Functionalised radicals in organic synthesis: 2-acyloxyalkyl radicals from 2-acyloxyalkyl iodides by the tin route
作者:Francisco Foubelo、Francisco Lloret、Miguel Yus
DOI:10.1016/s0040-4020(01)90423-5
日期:1994.4
The reaction of iodoesters 1a-c with electrophilic olefins 2a-d and in situ generated tributyltin hydride (from a substoichiometric amount of tributyltin chloride and an excess of sodium borohydride) in the presence of a catalytic amount of AIBN in ethanol at 0 to 20°C yields the expected coupling products 3aa-3cd. Products 4 resulting from an iodine/hydrogen exchange are also obtained as by-products
Vicinal dihalogenation of alkenes is a fundamental textbook reaction. Such reactions are still mainly performed by traditional methods that imply the use of toxic, corrosive and not easy to handle reagents. Herein, we report a simple, efficient and eco-friendly alternative that challenges those conventional methods and allows not only the homonuclear but also the heteronuclear dihalogenation of alkenes
Reactions of thallium(I) carboxylates and iodine with alkenes
作者:Richard C. Cambie、Rodney C. Hayward、John L. Roberts、Peter S. Rutledge
DOI:10.1039/p19740001858
日期:——
Treatment of an alkene with a thallium(I) carboxylate and iodine gives the corresponding vic-iodocarboxylate in high yield. The reactions are regiospecific and in conjunction with solvolysis of the products, offer an alternative to the Prévost reaction. Differences in the behaviour of thallium(I) carboxylates and silver carboxylates towards alkenes in the presence of iodine are discussed.
Thallium(<scp>I</scp>) carboxylates: a new class of reagents for the formation of α-iodocarboxylates
作者:Richard C. Cambie、Rodney C. Hayward、John L. Roberts、Peter S. Rutledge
DOI:10.1039/c39730000359
日期:——
Treatment of an alkene with a thallium(I) carboxylate and iodine gives the corresponding α-iodocarboxylate in high yield, thereby affording a regiospecific and inexpensive modification for the Prevost reaction.