59349-08-5Relevant academic research and scientific papers
Synthesis and characterization of some pyrazole derivatives of 1,5-diphenyl-1H-pyrazole-3,4-dicarboxylic acid
Kasimogullari, Rahmi,Arslan, B. Seckin
experimental part, p. 1040 - 1048 (2010/10/21)
(Chemical Equation Presented) Compound of 4-(ethoxycarbonyl)-1,5-diphenyl- 1H-pyrazole-3-carboxylic acid 2 was obtained from the reaction of ethyl 4,5-dioxo-2-phenyl-4,5-dihydrofuran-3-carboxylate and 1-benzylidene-2- phenylhydrazine. A number of substitute pyrazole dicarboxylic acid derivatives (4, 5a-c, 6, 7, 8, 9a-m, 10, 11, 12, 13, 14) were synthesized from 1,5-diphenyl-1H-pyrazole-3,4-dicarboxylic acid 3 which was prepared from basic hydrolysis of 2. Structures of synthesized compounds were characterized by 1H NMR, 13C NMR, Mass, FTIR, and elemental analysis.
Pyrrolo-1,3,4-thiadiazole Derivatives from Mesomeric Heteropentalenes and Azodicarboxylic Esters
Gotthardt, Hans,Boehm, Frank-Rainer,Brauer, David J.,Weisshuhn, C. Michael,Wilke, C. Jochen
, p. 95 - 104 (2007/10/02)
The mesomeric heteropentalene betaines of type 4,7, and 18 display an unusual reaction behavior against the azodicarboxylic esters 8a-c.Surprisingly, 4 reacts with 8a,b to produce 17a,b, whereas the reaction of 4 with 8c leads to 11 and the novel azomethine imine 15.Also the reaction of 18 with 8a-c gives in two cases 20 or 25 beside the azomethine imine 19.Furthermore, 7 reacts with 8a to form 26, whereas the reaction of 7 with 8c surprisingly yields 29.Spectroscopic data as well as the results of the X-ray analyses of 17a and 19 are consistent with the structures.
