期刊
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
卷 14, 期 -, 页码 1287-1292出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.14.110
关键词
dimerization; NMR (H-1; C-13; N-15); pyrazolones; X-ray structure analysis; thionyl chloride
资金
- University of Sassari (Italy)
Dialkyl 5,5'-dioxo-4,4'-bipyrazole-4,4'-dicarboxylates are readily obtained by the reaction of 5-hydroxypyrazole-4-carboxylates in refluxing thionyl chloride. The obtained diesters can be transformed into the corresponding 4,4'-bipyrazoles via alkaline hydrolysis and subsequent decarboxylation. Detailed NMR spectroscopic investigations (H-1, C-13, N-15) were undertaken with all products prepared. Moreover, the structure of a representative 5,5'-dioxo-4,4'-bipyrazole-4,4'-dicarboxylate was confirmed by X-ray crystal structure analysis.
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