GB1364982A - Phenylalanine derivatives - Google Patents
Phenylalanine derivativesInfo
- Publication number
- GB1364982A GB1364982A GB1522472A GB1522472A GB1364982A GB 1364982 A GB1364982 A GB 1364982A GB 1522472 A GB1522472 A GB 1522472A GB 1522472 A GB1522472 A GB 1522472A GB 1364982 A GB1364982 A GB 1364982A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aqueous solution
- dihydroxyphenylalanine
- march
- crystals
- supersaturated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C229/00—Compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C229/02—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton
- C07C229/34—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton containing six-membered aromatic rings
- C07C229/36—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton containing six-membered aromatic rings with at least one amino group and one carboxyl group bound to the same carbon atom of the carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C227/38—Separation; Purification; Stabilisation; Use of additives
- C07C227/40—Separation; Purification
- C07C227/42—Crystallisation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1364982 Dopa DYNAMIT NOBEL AG 30 March 1972 [31 March 1971] 15224/72 Heading C2C L(-) - 3,4 - Dihydroxyphenylalanine is prepared by preparing a saturated aqueous solution of DL-3,4-dihydroxyphenylalanine at a temperature above 50 C., cooling the saturated aqueous solution to a lower temperature which is not below 45 C. to form a supersaturated aqueous solution, seeding the supersaturated aqueous solution with crystals of L(-)-3,4-dihydroxyphenylalanine to cause L(-)-3,4-dhydroxyphenylalanine to crystallize out of the supersaturated aqueous solution, and separating off the crystals of L(-)-3,4-dihydroxyphenylalanine thus formed from the aqueous solution before more than 95% of the theoretical quantity thereof has crystallized out.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712115529 DE2115529A1 (en) | 1971-03-31 | 1971-03-31 | Process for the preparation of L (-) - 3,4-dihydroxyphenylalanine |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1364982A true GB1364982A (en) | 1974-08-29 |
Family
ID=5803330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1522472A Expired GB1364982A (en) | 1971-03-31 | 1972-03-30 | Phenylalanine derivatives |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH572898A5 (en) |
DE (1) | DE2115529A1 (en) |
FR (1) | FR2132287B1 (en) |
GB (1) | GB1364982A (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1241405A (en) * | 1969-04-23 | 1971-08-04 | Ajinomoto Kk | Resolution of phenylalanine derivatives |
-
1971
- 1971-03-31 DE DE19712115529 patent/DE2115529A1/en active Pending
-
1972
- 1972-03-24 CH CH443572A patent/CH572898A5/xx not_active IP Right Cessation
- 1972-03-30 GB GB1522472A patent/GB1364982A/en not_active Expired
- 1972-03-30 FR FR7211354A patent/FR2132287B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2132287B1 (en) | 1975-10-10 |
CH572898A5 (en) | 1976-02-27 |
DE2115529A1 (en) | 1972-10-05 |
FR2132287A1 (en) | 1972-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |