New synthetic approaches to substituted aromatic compounds are reported. Ring-closingolefinmetathesis (RCM)/dehydration and RCM/tautomerization are the key processes in the synthesis of substituted benzenes 3 and phenols 6, respectively. Readily accessible 1,5,7-trien-4-ols 7, which are the precursors of benzenes, were prepared from beta-halo-alpha,beta-unsaturated aldehydes 11 or beta-halo-alpha
ESR studies of deuteriated polycyclic aromatic radical cations
作者:Hong Sang、Hanqing Wang
DOI:10.1002/mrc.1260300210
日期:1992.2
Several deuteriated polycyclic aromatic radicalcations were studied by ESR. Their hyperfine coupling constants are reported and mechanisms for their formation are proposed.
ENDOR and EPR studies on polycyclic aromatic radical cations
作者:Hong Sang、Hanqing Wang、K. P. Such、F. Jent
DOI:10.1002/mrc.1260300211
日期:1992.2
Several polycyclic aromatic radicalcations produced in Friedel–Craftsalkylationreactions were studied by EPR and ENDOR methods, and the following were identified: 1,2,5,6‐tetramethylanthracene, 2,3,6,7,9,10‐hexamethylanthracene, 3,6,11,14‐tetramethyldibenzo [a,c]triphenylene and 2,6,9,10‐tetramethylanthracene radicalcations.