Further insight via 15N NMR spectroscopy into the reactive intermediates formed by superacid protonation of crowded nitro-PAHs: persistent dihydroxyiminiumpyrenium and hydroxyiminiumpyrenium dications
作者:Kenneth K. Laali、Poul Erik Hansen
DOI:10.1039/a800208h
日期:——
FSO3H·SbF5 (4∶1)–SO2ClF generates either the dihydroxyiminiumpyrenium dication (NO2 diprotonation) or the hydroxyiminiumpyrenium dication as the principle NMR observable persistent species (depending on the sample concentration, reaction time and the superacid). The latter is independently generated by diprotonation of authentic 1-nitrosopyrene. Variable formation of dihydroxyiminiumpyrenium and hydroxyiminiumpyrenium
Synthesis, Characterization, and Comparative Conformational Analysis of <i>N</i>-(Deoxyguanosin-8-yl)aminopyrene Adducts Derived from the Isomeric Carcinogens 1-, 2-, and 4-Nitropyrene
作者:Li Zhou、Bongsup P. Cho
DOI:10.1021/tx970115p
日期:1998.1.1
guanine and the pyrene moiety. These adducts are structurally isomeric, thus providing an interesting opportunity for systematic probing of the isomeric adduct conformations. Spectroscopic data indicated that the three isomeric aminopyrene adducts favor anti-glycosyl conformations, with C2'-endo (S) sugar puckering and a nearly planar conformation at the central amine nitrogen. The data further indicated