Wittig condensation products from nickel meso-formyl-octaethyl-porphyrin and -aetioporphyrin I and some cyclisation reactions
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 12,p. 1660-1670
- https://doi.org/10.1039/p19780001660
Abstract
Various Wittig condensation products from the named meso-formylporphyrins are described, together with some transformations of the products. Vilsmeier formylation of the nickel meso-vinyl derivatives causes substitution mainly in the side-chain, and acid cyclisation of the meso-acrylaldehyde products results in the formation of a fused benzene ring and the structure of the product is fully defined by X-ray crystallography. In the absence of nickel, mild acid cyclisations of the meso-acrylaldehydes or esters yield purpurins.Keywords
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