Rate measurements of certain Vilsmeier–Haack reactions. Part 3. The reactivities of various pyrrole substrates
作者:Julian White、George McGillivray
DOI:10.1039/p29840001179
日期:——
The rates of reaction of six pyrrole substrates with the Vilsmeier–Haack reagent derived from NN-dimethylbenzamide (and in some cases from N-benzoylmorpholine or NN-diethylbenzamide) and phosphoryl chloride were measured. The deactivating effect on substitution at the 5-position of a groups when present at the 2-and 4-position. This net activation of the substrate was lost when the bulkier Vilsmeier–Haack