1,3-Propanediol → HCID 22750489, compound

Participants

Reaction Steps

100 g of a polyester of undecanedioic acid and 1,3-propanediol, having a degree of polymerization of 29 and an acid number of 7 mg KOH/g, is mixed with 3 g of one of the catalysts listed in Table 2 (derived from French Pat. No. 796,410) in a distillation flask of a conventional vacuum distillation apparatus. The mixture is thermolyzed for 4-5 hours under vacuum (pressure: less than 0.5 mbar) at 270° C. The yields of crude 1,5-dioxacyclohexadecane-6,16-dione, based on the amount of polyester employed, are listed in Table 2.

Provenance & Evidence