n-butyllithium in hexane; Petroleum ether byproducts: butane, LiBr; the urea in petroleum ether was refluxed under N2 with n-BuLi in hexanefor 48 h; the solvents were removed in vac., the residue was fractional distd.; elem. anal.;
sulfuric acid; sulfur trioxide in 1,2-dichloro-ethane 1.) r.t., 15 min; 2.) 70-80 deg C; effect of oleum concentration in different solvents, influence of the temperature of dissolution of sulfuric acid, influence of reaction temperature on the yield; Product distribution;
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Gareev; Bol'shedvorskaya; Cherkashina; Flippova; Gaer; Vereshchagin; Sakovich
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Temprado, Manuel; Roux, Maria Victoria; Ros, Francisco; Notario, Rafael; Segura, Marta; Chickos, James S.
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