and chloroformate. But it takes 10 days to compete the reaction. How can I shorten the time of the reaction?
Increasing temperature and concentration should help speed up the reaction.
In this reaction you can use catalytic amount of DMAP (4-dimethylaminopyridine) to speed up the reaction rate. Some times DMF is also used but it is less effective than DMAP.
Be careful with competition between cyclization and step-growth polymerization
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