Quantitative Hydrogenation of Substituted Azo Compounds 1687 range (250°up) on heating no analyses were made. The coronene recovered from this picrate by chromatographic adsorption on alumina was lighter in color than the original coronene but unchanged in melting point. The symtrinitrobenzene derivative of coronene separated in bright orange needles from benzene but melted with decomposition over a wide range (280°up).
THE determination of water in insulating oil, and more especially oil-impregnated paper of high-voltage cable, has received considerable attention by analysts because of its deleterious effect when present in insulating material. The procedures which have been used in the past may be divided into two main classes: gas evolution and water evolution. The former group comprises reagents such as sodium, yielding hydrogen (7); calcium carbide, yielding acetylene (1); sodamide, giving ammonia; and Grignard reagents-for example, methyl magnesium halide-producing methane (8).
N. Y. THE application of the Grignard reagent to the determination of active hydrogen in compounds is frequently referred to as the Zerewitinoff (8) method. Recently the use of the Grignard reagent for the study of the rate of formation of oil deterioration products has been reported by Larsen (4), Balsbaugh and Oncley (£), and Assaf and Gladding (1). These authors employ a volumetric method and determine the excess of reagent at the end of the test in order to compute the quantity of reagent entering into an addition reaction. An excellent review and description of the volumetric procedure are given by Niederl and Niederl (6).The method described in this paper employs a more precise -weight procedure in which the evolved methane is burned
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.