Tautomerism in the Solid State and in Solution of a Series of 6-Aminofulvene-1-aldimines
作者:Dionisia Sanz、Marta Pérez-Torralba、Sergio Hugo Alarcón、Rosa María Claramunt、Concepción Foces-Foces、José Elguero
DOI:10.1021/jo010625v
日期:2002.3.1
the tautomeric equilibria, i.e., on what nitrogen atom is the proton, was determined in the solidstate and in solution. The crystal structure of N[[5-[(phenylamino)methylene]-1,3-cyclopentadien-1-yl]methylene]pyrrole-1-amine (3) has been determined by X-ray analysis. In solution, both N-H and C-H tautomers were observed and their structures assigned by NMR spectroscopy. Particularly useful is the
Generation of Phosphorus Oxychloride as by-Product from Phosphorus Pentachloride and DMF and its Use for Chlorination Reaction by Converting Into Vilsmeier-Haack Reagent
申请人:Ratnam Rakesh
公开号:US20090131653A1
公开(公告)日:2009-05-21
A process is described wherein after formation of first crop of Vilsmeier-Haack reagent by reacting Phosphorus Pentachloride with N,N-dimethylformamide to form a first crop of Vilsmeier reagent as insoluble crystals, a by-product of this reaction, the Phosphorus Oxy-Chloride, reacts with N,N-dimethylformamide to give a second crop of Vilsmeier reagent. This second crop of Vilsmeier reagent is soluble in DMF. This process makes it possible to double the yield of chlorinated substrate, such as sucrose-6-acetate or sucrose-6-benzoate, from the same quantity of Phosphorus Pentachloride.