Cycloaddition products of 3-oxido-1-phenylpyridinium and 1-cyanoacenaphthylene
作者:Yvette A. Jackson、Lillian M. Rogers、Robin D. Rogers、Michael P. Cava
DOI:10.1039/a709091i
日期:——
Cycloaddition of 3-oxido-1-phenylpyridinium 8a to 1-cyanoacenaphthylene 9a affords three isomeric adducts (13, 14 and 15). Structures for these compounds resulted from a comparative NMR study, as well as an X-ray crystallographic determination of isomer 15. Attempts to eliminate HCN from compounds 13–15 resulted only in cycloreversion to 1-cyanoacenaphthylene.
1,3-Dipolar character of six-membered aromatic rings. Part 52. 2π+ 8π Cycloaddition reactions of 1-substituted 3-oxidopyridinium betaines
作者:Alan R. Katritzky、Alan T. Cutler、Nicholas Dennis、Gebran J. Sabongi、Soheila Rahimi-Rastgoo、Gerhard W. Fischer、Ian J. Fletcher
DOI:10.1039/p19800001176
日期:——
Dichloroketen and a series of aryl(bromo)ketens react with various 1-substituted 3-oxidopyridiniums to give novel bicyclic compounds by addition across the C(4)–O and the C(2)–O positions. Frontier-MO theory is used to rationalise the orientation of these cycloadditions. Acid-catalysed hydrolysis of the C(2)–O adducts (9) yielded 3-hydroxy-2-benzylpyridines.