I'm synthesizing a substituted phthalocyanine from phthalonitrile in n-pentanol solvent using DBU as a base and a metal salt but the colour of reaction mass is not turning blue/green after refluxing as reported in the literature. When I try this reaction in a small scale (50 mg), I get a blue/green colour. What went wrong? Now I am only getting a brown colour formation which may due to polymerization or triazine formation of the substrate. What precautions should I take to always get the desired phthalocyanine product?
Viktor Ya Chernii
Hi, In small quantities, local overheating is possible. Try using a higher boiling alcohol
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