Optically pure (L)-vinylglycine has been synthesised by two different methods. The first of these involves protected (L)-glutamate esters of N-hydroxy-2-seleno-pyridine. Such esters are shown to undergo the same decarboxylotive rearrangement as their thio-analogues. Oxidative elimination of the selenopyridine residue with ozone, and with the aid of hex-1-ene as sacrificial olefin for the work-up, gave
How Solvent Modulates Hydroxyl Radical Reactivity in Hydrogen Atom Abstractions
作者:Susan Mitroka、Stephanie Zimmeck、Diego Troya、James M. Tanko
DOI:10.1021/ja903856t
日期:2010.3.10
The hydroxylradical (HO*) is a highly reactive oxygen-centered radical whose bimolecular rate constants for reaction with organic compounds (hydrogen atom abstraction) approach the diffusion-controlled limit in aqueoussolution. The results reported herein show that hydroxylradical is considerably less reactive in dipolar, aprotic solvents such as acetonitrile. This diminished reactivity is explained
Chemistry of the (Z)-cyclo-oct-4-enyl radical including the preparation of 18O2-labelled (Z)-cyclo-oct-4-enyl hydroperoxide
作者:A. J. Bloodworth、David Crich、T. Melvin
DOI:10.1039/p19900002957
日期:——
Photolysis of the O-acyl thiohydroxamate (2), precursor to the (Z)-cyclo-oct-4-enylradical, in the presence of 18O2 and a tertiary thiol provides the labelled hydroperoxide (8). The parent (Z)-cyclo-oct-4-enylradical is shown to undergo transannular cyclization only under relatively forcing conditions.
(Z)-环-辛-4-烯基自由基的前体O-酰基硫代异羟肟酸酯(2)在18 O 2和叔硫醇的存在下进行光解,得到标记的氢过氧化物(8)。母体(Z)-环-辛-4-烯基仅在相对强迫的条件下才经历环环化。
The invention of radical reactions
作者:Derek H.R. Barton、Brigitte Lacher、Samir Z. Zard
DOI:10.1016/s0040-4020(01)90307-2
日期:——
Thiohydroxaimic esters of aromatic carboxylic acids undergo clean decarboxylative bromination or iodination on treatment with bromotrichloromethane, odoform or diiodomethane in the presence of a radical initiator.
Radical decarboxylative bromination of aromatic acids
作者:Derek H.R. Barton、Brigitte Lacher、Samir Z. Zard
DOI:10.1016/s0040-4039(00)98266-2
日期:1985.1
Thiohydroxamic esters (mixed anhydrides) of aromatic and α,β-unsaturated carboxylic acids undergo clean decarboxylative bromination on treatment with bromotrichloromethane in the presence of a radical initiator.