Synthesis and properties of 1-bromo-2,3,5,6-tetrakis(3-pentyl)benzene: a highly sterically hindered aryl bromide
作者:Barry R. Steele、Maria Micha-Screttas、Constantinos G. Screttas
DOI:10.1016/j.tetlet.2004.10.144
日期:2004.12
The preparation of 1-bromo-2,3,5,6-tetrakis(3-pentyl)benzene is reported. The H-1 and C-13 NMR spectra indicate the presence of rotational isomers at room temperature which interconvert on heating. Coalescence of the NMR peaks for the methine and methylene aliphatic protons is observed at 100-120degreesC. The conversion of this aryl bromide to the corresponding aryllithium is reported. Similar but less bulky aryl bromides have also been synthesised. (C) 2004 Elsevier Ltd. All rights reserved.
Contrasting chemoselectivities in the ultrasound and microwave assisted bromination reactions of substituted alkylaromatics with N-bromosuccinimide
作者:Georgios A. Heropoulos、Giancarlo Cravotto、Constantinos G. Screttas、Barry R. Steele
DOI:10.1016/j.tetlet.2007.03.023
日期:2007.4
and microwave assisted brominationreactions of various alkylaryls with N-bromosuccinimide, either neat or in water, shows diverse chemoselectivity. Thus, ring substitution occurs in water with ultrasound, whereas with microwaves both side-chain α-bromination and ring substitution occur. With neat reactants, side-chain α-bromination predominates for microwave assisted reactions. In the presence of water