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(a) Synthetic scheme to MeO2DHAC. I. Trimethyl orthoformate, p-toluenesulfonic acid, and methanol, followed by sodium carbonate. II. Performed through three different methods involving trisphosgene,93 ethyl chloroformate,93 or oxidative carbonylation. 121 (b) Synthetic scheme to EOPDC. I. p-toluenesulfonic acid, glycol, and benzene. II. triphosgene, pyridine, and dichloromethane.113 Figure 10b is adapted from ref 113, with permission from the Chinese Chemical Society.
