Chlorin

In organic chemistry, chlorins are tetrapyrrole pigments that are partially hydrogenated porphyrins. The parent chlorin is an unstable compound which undergoes air oxidation to porphine. The name chlorin derives from chlorophyll. Chlorophylls are magnesium-containing chlorins and occur as photosynthetic pigments in chloroplasts. The reduced chlorin variants are present in bacteriochlorophylls and are named ‘bacteriochlorins’ and ‘isobacteriochlorins’.