The synthesis and assay of radiolabelled benzene derivatives
摘要:
several new syntheses of 1- and 4-[C-14]anisole have been investigated and routes from [C-14]cyanide and from 2-[C-14]acetone are described which are better than those previously reported The key step in one of the syntheses was catalytic dehydrogenation of 1-[C-14]cyclohexanone to 1-[C-14]phenol. Degradation of 5,6,7,8-tetrachloro-3,4-dihydro-1,4-etheno-[C-14]naphtahalen-2(1H)-one (10) prepared from [C-14]anisole and tetrachlorobenzyne has shown that the key step had proceeded without scrambling of the label.
Regiospecific fragmentation of benzene derivatives: synthetic and analytical applications
作者:Neil J Hales、Harry Heaney、John H Hollinshead、Steven V Ley
DOI:10.1016/0040-4020(95)00395-o
日期:1995.7
The cycloadducts farmed from arenes and tetrachloroand tetrafluorobenzyne have been shown to undergo specific addition-fragmentation reactions. These sequences are both simple syntheses of arenes with unusual substitution patterns and a convenient alternative to the other methods currently available for assaying the isotopic distribution in [14C]-labelled benzene derivatives.
Transition Metal-Catalyzed [4 + 2 + 2] Cycloadditions of Bicyclo[2.2.1]hepta-2,5-dienes (Norbornadienes) and Bicyclo[2.2.2]octa-2,5-dienes<sup>1</sup>
作者:Yan Chen、Rattana Kiattansakul、Bin Ma、John K. Snyder
DOI:10.1021/jo010268o
日期:2001.10.1
The transition-metal-catalyzed [4 + 2 + 2] cycloadditions of norbornadienes, bicyclo[2.2.2]octa-2,5-diene, and benzobarrelene with 1,3-butadienes proceed in excellent yields using cobalt-based catalytic systems. Two key distinctions between these [4 + 2 + 2] cycloadditions and the corresponding transition-metal-catalyzed [2 + 2 +2] reactions of norbornadiene are the requirement of a bimetal catalytic