Z. Gross et al., Solvent-free condensation of pyrrole and pentafluorobenzaldehyde: A novel synthetic pathway to corrole and oligopyrromethenes, ORG LETT, 1(4), 1999, pp. 599-602
[GRAPHICS]
The solvent-free condensation of pyrrole and pentafluorobenzaldehyde (and t
o a lesser extent other electron poor aldehydes as well) leads to a variety
of products, of which three have been isolated and fully characterized. Th
e two main products (11% each) are an open-chain pentapyrrole and corrole,
a tetrapyrrolic macrocycle.