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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.
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Arnold et al. (1978) studied this question.
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