Preparation process and purification process of cyclic ester

Details Preparation process and purification process of cyclic ester Preparation process and purification process of cyclic ester

1997-09-22

1999-05-04

Stockton, Laura L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31906, C07D31912

Patent

active

059004916

ABSTRACT:
A process for preparing a cyclic ester by reacting an .alpha.-hydroxycarboxylic acid or an .alpha.-hydroxycarboxyliclic acid ester with an orthoester. A process for purifying a cyclic ester by containing water and acid as impurities by adding an orthoester to a cyclic ester obtained by reaction of a reaction mixture including an .alpha.-hydrocarboxylic acid or an .alpha.-hydroxycarboxyliclic acid ester. According to the present invention, a high-purity cyclic ester containing small amounts of impurities such as water and an acid component can be provided.

REFERENCES:
patent: 1095205 (1914-05-01), Gruter et al.
patent: 2668162 (1954-02-01), Lowe
patent: 4797468 (1989-01-01), De Vries
patent: 5053522 (1991-10-01), Muller
Takeshi Ito, "Production of Aliphatic Polyester", Abstract of JP 5-287056 A (Toyobo Co. Ltd.), Nov. 2, 1993.
Hiroshi Takayanagi, "Purification of Crude Glycollide", Abstract of JP 59-14877 A (Mitsui Toatsu Kagaku K.K.), Aug. 25, 1984.
Kamio Yonemoto, "Production of Unsaturated Dicarboxylic Acid Imide-Based Compound", Abstract of JP 3-223248 A (Matsushita Electric Works, Ltd.), Oct. 2, 1991.
Takeshi Ito, "Production of Aliphatic Polyester", Abstract of JP 6-287278 A (Toyobo Co., Ltd.), Oct. 11, 1994.
Seishi Hotta et al., "Production of Lactide", Abstract of JP 7-309862 A (Toyobo Co., Ltd.), Nov. 28, 1995.
Kazuomi Kubota, "Purification of Lactide", Abstract of JP 6-279435 A (Dainippon Ink & Chem., Inc.), Oct. 4, 1994.
Makoto Oguchi, "Method for Purifying Lactide and Method for Polymerizing the Same", Abstract of JP 7-118259 A (Shimadzu Corp.), May 9, 1995.
Makoto Oguchi, "Method for Purifying Lactide and Method for Polymerizing the Same", Abstract of JP 7-206851 A (Shimadzu Corp.), Aug. 8, 1995.
Chemical Abstracts, vol. 124, No. 23, 1996, Colombus, Ohio, US, abstract No. 317180r of JP 07-309-862 A, p. 1222.

Affiliated with

Also associated with

Rating

Preparation process and purification process of cyclic ester does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation process and purification process of cyclic ester, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation process and purification process of cyclic ester will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1870054