GB1364982A - Phenylalanine derivatives - Google Patents

Phenylalanine derivatives

Info

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
Application number
GB1522472A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Publication of GB1364982A publication Critical patent/GB1364982A/en
Expired legal-status Critical Current

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.
GB1522472A 1971-03-31 1972-03-30 Phenylalanine derivatives Expired GB1364982A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1241405A (en) * 1969-04-23 1971-08-04 Ajinomoto Kk Resolution of phenylalanine derivatives

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