Process for preparing 2H-1-benzopyran-2-ones and polyesters cont

Details Process for preparing 2H-1-benzopyran-2-ones and polyesters cont Process for preparing 2H-1-benzopyran-2-ones and polyesters cont

1990-10-04

1992-02-25

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From ketone or ketene reactant

528272, 528289, 528290, 528293, 528295, 528298, 528302, 528304, 5283086, 528332, 528335, 528337, 528377, 528390, 528391, 528392, 528401, 528403, 525411, 548159, 548223, 549277, 549280, 549288, C08G 1600

Patent

active

050915010

ABSTRACT:
This invention provides a process for producing 2H-1-benzopyran-2-ones (coumarins) from optionally-substituted o-halocinnamic acids or esters under polyester-forming conditions. When the coumarins contain appropriately reactive functional groups, and desired monomers are present, a colored or UV-absorbing coumarin/polyester copolymer is provided in one step.

REFERENCES:
patent: 3148163 (1964-09-01), Freyermuth
patent: 3285993 (1966-11-01), Inamoto et al.
patent: 4105665 (1978-08-01), Harnisch
patent: 4347350 (1982-08-01), Horner et al.
patent: 4892922 (1990-01-01), Weaver et al.
Organic Reactions, Sethna & Phadke, 7, pp. 1, (1953).
Organic Reactions, J. R. Johnson, vol. 1, pp. 210, (1942).
Heterocyclic Compounds "Coumarins", R. C. Elderfield, vol. 2, p. 173.
Organic Syntheses, E. C. Horning et al, 1948, 28, p. 24.

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