An unusual thionyl chloride-promoted C−C bond formation to obtain 4,4'-bipyrazolones
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 d...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2018-06-01
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| Series: | Beilstein Journal of Organic Chemistry |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjoc.14.110 |