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  • 1
    Electronic Resource
    Electronic Resource
    Chirospecific synthesis of D and Lp-chlorohomophenylalanine N-t-BOC DCHA salts (1994)
    Springer
    Amino acids 6 (1994), S. 97-105 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Chirospecific ; D-Glucosamine hydrochloride ; D-Mannosamine hydrochloride ; L-N-t-Butyloxycarbonylserinal ; D-N-t-Butyloxycarbonylserinal ; D-p-Chlorohomophenylalanine N-t-Boc DCHA salt ; L-p-Chlorohomophenylalanine N-t-Boc DCHA salt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The chirospecific conversions of D-glucosamine hydrochloride and D-mannosamine hydrochloride to the configurationally stable L and D isomers of N-t-butyloxycarbonylserinal were carried out byt-butylcarbonylation followed by sodium borohydride reduction and sodium meta-periodate oxidation. Reaction of the L and D aldehydes with the Wittig reagent prepared from 4-chlorobenzyltriphenylphosphonium chloride and butyl lithium followed by catalytic hydrogenation, Jones oxidation and salt formation with dicyclohexylamine gave the DCHA salts of the D and L isomers ofp-chlorohomophenylalanine N-t-Boc in high enatiomeric excess. The optical purity of the title compounds was established by hydrolysis to the respective free amino acids, followed by chiral derivatization and HPLC analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808125
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  • 2
    Electronic Resource
    Electronic Resource
    Cytogenetic study of an interspecific cross of Nicotiana debneyi X N. umbratica (1982)
    Springer
    Theoretical and applied genetics 63 (1982), S. 177-181 
    Details
    ISSN: 1432-2242
    Keywords: Cytogenetics ; Interspecific hybrid ; Nicotiana debneyi ; N. umbratica ; Colchiploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Interspecific F1 hybrids of Nicotiana debneyi Domin (2n=48) and N. umbratica Burbidge (2n=46), both belonging to the section Suaveolentes, showed a high degree of meiotic chromosome pairing. Two of the five F2 plants obtained exhibited chromosome mosaicism. The first colchiploid generation (C1) had the expected chromosome number of 2n=94 while C2 showed 2n=88, a loss of three pairs of chromosomes. This same chromosome number continued in further colchiploid generations, followed up to C5, except for a few plants in C3 which showed chromosome mosaicism. The F1 phenotype was stable through C1 to C5 and fertility was normal in colchiploids through all generations in spite of the loss of three pairs of chromosomes and chromosome mosaicism. This stability and fertility apparently reflect the tolerance of the genomes to the genetic adjustment of chromosome complements which is believed to be associated with the originally polyploid nature of the parental species and the chromosome doubling brought about in the amphidiploids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303705
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    Paper (German National Licenses)
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