One-step synthesis of dinitropolymethylbiphenyls from polymethylbenzenes

Determination of nitrogen compound distribution in petroleum by gas chromatography with a thermionic detector

“…The thermionic emission or detector sensitivity could not be controlled independently of the flame. However, in newer detector designs that are now available, e.g., (22)(23)(24)(25)(26), the instability problem has been minimized and made controllable by employing more thermally stable alkali metal sources, such as rubidium silicate, and providing an electrical heating source so that the level of thermionic emission can be precisely controlled. These newer detector designs are receiving increasing attention in the analysis of many complex materials.…”

“…EXPERIMENTAL Materials. Reference nitrogen compounds were obtained from commercial sources except for two compounds, 2,3,5,7-tetramethylcarbazole and 1,2,4,6,7-pentamethylcarbazole, which were synthesized (23). Hydrocarbons were Phillips pure grade.…”