中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
吡咯-2,4-二甲腈 | pyrrole-2,4-dicarbonitrile | 74023-87-3 | C6H3N3 | 117.11 |
The preparation of the acetals of a number of pyrrole mono- and dicarboxaldehydes is described. It is shown that, provided the reactivity of the unsubstituted ring positions on the pyrrole nucleus is not too low, a carboxyaldehyde or a carbonitrile group may be substituted onto the pyrrole ring using the Vilsmeier reaction or chlorosulfonyl isocyanate respectively. Vilsmeier formylation of the diacetal, 2,4-di(5,5-dimethyl- 1,3-dioxan-2-yl)-pyrrole, followed by hydrolysis gave pyrrole-2,3,5-tricarboxaldehyde.