Process for the production of cyclic diesters of dodecanedioic a

Details Process for the production of cyclic diesters of dodecanedioic a Process for the production of cyclic diesters of dodecanedioic a

1976-10-19

1978-08-08

Milestone, Norma S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D32100

Patent

active

041056728

ABSTRACT:
Cyclic esters of dodecanedioic acid with aliphatic diols of 2-12 carbon atoms in the chain and substituted by up to two alkyl of 1-4 carbon atoms, are produced by thermolysis of corresponding linear polyesters under reduced pressure in the presence of catalysts by subjecting the linear polyesters to thermolysis at temperatures between 200.degree. and 300.degree. C., and by utilizing as catalyst a tin(II) salt of an aliphatic monocarboxylic acid of up to 18 carbon atoms, of an aromatic or araliphatic monocarboxylic acid of up to 36 carbon atoms, of an aliphatic or aromatic hydroxy-, poly-, ketocarboxylic acid or of a dicarboxylic acid of up to 18 carbon atoms; or a mixture of an organotin compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are alkyl of 1-18 carbon atoms, or aryl or aralkyl of 6-36 carbon atoms, and an O,O-dialkyl-(3,5-di-tert.-butyl-4-hydroxybenzyl)-phosphonate wherein each alkyl is of 2-18 carbon atoms.

REFERENCES:
patent: 2092031 (1937-09-01), Spanagel
patent: 2163109 (1939-06-01), Spanagel
patent: 3431279 (1969-03-01), Ehrhart
Chemical Abstracts, vol. 72 (1970) 12133v.
Chemical Abstracts, vol. 77 (1972) 139625r.
Chemical Abstracts, vol. 83 (1975) 115656z.

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