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  • 1
    Electronic Resource
    Electronic Resource
    Optical resolution by preferential crystallization of DL-methionine hydrochloride (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 48-51 
    Details
    ISSN: 0899-0042
    Keywords: amino acid ; successive optical resolution ; conglomerate ; binary phase diagram ; racemic structure ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: DL-Methionine hydrochloride (DL-Met·HCl) was found to exist as a conglomerate, based on the infrared spectrum, solubility, and melting point. The optical resolution of DL-Met·HCl was successfully achieved by preferential crystallization into D-and L-Met·HCl. Treatment of the purified D- and L-Met·HCl with triethylamine gave D- and L-methionine of 100% optical purities. Chirality, 9;48-51, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Successive optical resolution by replacing crystallization of DL-threonine (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 654-657 
    Details
    ISSN: 0899-0042
    Keywords: successive optical resolution ; replacing crystallization ; threonine ; optically active cosolute ; L-serine ; 4-hydroxy-L-proline ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: DL-Threonine [DL-Thr; (2RS,3SR)-2-amino-3-hydroxybutanoic acid] was optically resolved by replacing crystallization using L-serine (L-Ser) and 4-hydroxy-L-proline (L-Hyp) as optically active cosolutes. D-Thr was allowed to crystallize preferentially from racemic aqueous solutions in the presence of these L-α-amino acids. The optical resolution of DL-Thr was more successfully achieved by using L-Ser, whose structure is more similar to that of DL-Thr than L-Hyp, and successively gave D- and L-Thr of 87 - 92% optical purities. The D- and L-Thr obtained were then recrystallized from water to give optically pure D- and L-Thr. © 1994 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060809
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  • 3
    Electronic Resource
    Electronic Resource
    Optical resolution by preferential crystallization of (2RS,3SR)-2-amino-3-chlorobutanoic acid hydrochloride (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 656-660 
    Details
    ISSN: 0899-0042
    Keywords: β-chloro-α-amino acid ; conglomerate ; successive optical resolution ; racemic structure ; (2RS,3SR)-ACB · HCl ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (2RS,3SR)-2-Amino-3-chlorobutanoic acid hydrochloride [(2RS,3SR)-ACB · HCl] was found to exist as a conglomerate based on the melting point, infrared spectrum, and solubility. Optical resolution by preferential crystallization of (2RS,3SR)-ACB · HCl was achieved to yield both (2R,3S)- and (2S,3R)-ACB · HCl of 80-100% optical purities. The obtained (2R,3S)- and (2S,3R)-ACB · HCl were recrystallized, taking into account the solubility of (2RS,3SR)-ACB · HCl, to give efficiently optically pure (2R,3S)- and (2S,3R)-ACB · HCl. Treatment of the purified (2R,3S)- and (2S,3R)-ACB · HCl with triethylamine gave optically pure (2R,3S)- and (2S,3R)-2-amino-3-chlorobutanoic acid, respectively. Chirality 9:656-660, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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