29284-44-4Relevant academic research and scientific papers
Expeditious method for synthesis of symmetrical 1,3-disubstituted ureas and thioureas
Perveen, Shahnaz,Abdul Hai, Syed M.,Khan, Rashid A.,Khan, Khalid Mohammed,Afza, Nighat,Sarfaraz, Tahira B.
, p. 1663 - 1674 (2007/10/03)
Symmetrical 1,3-disubstituted ureas and symmetrical thioureas have been synthesized from corresponding isocyanates, diisocyanates, and isothiocyanates by a new versatile, simple, and quick method in the presence of tertiary amines at room temperature. The method under discussion has several advantages over the existing techniques, as it is simple to carry out, does not require complicated equipment, has a simple workup, and does not use expensive chemicals. Moreover, the yields are almost quantitative. This method has potential in commercial applications. Copyright Taylor & Francis, Inc.
Doubled azo dyes
-
, (2008/06/13)
There are described azo dyes of the formula STR1 where in case a) m is 1, n is 0, Y is hydroxyl, and L is C1 -C6 -alkylene, or in case b) m is 0 or 1, n is 1, X is hydrogen, Y is imino, and L is 1,4-piperazinediyl when m is 0 or C2 -C6 -alkylene or phenylene when m is 1, the use thereof for dyeing or printing paper stock, and dye mixtures comprising the dyes.
