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  • 1980-1984  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Asymmetric induction in the radical copolymerization of mono and di-l-menthyl fumarate with styrene (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 115-124 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Radical copolymerizations of mono- and di-l-menthyl fumarate (1 and 2) with styrene (St) were carried out, and the copolymers were hydrolyzed with potassium hydroxide. The products show still optical activity even after the removal of the optically active side chain, because of an introduction of asymmetry into the main chain of the copolymer. The specific rotation per one of the diad sequences of hydrolyzed poly(1-co-St) was the same as that of hydrolyzed poly(2-co-St). The mechanism of asymmetric induction and the position of the new asymmetric center are discussed based on the measurements of UV spectra, optical rotation, and circular dichroism.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1982.021830110
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Asymmetric induction copolymerization of isobutyl vinyl ether with indene by (-)-menthoxyaluminium dichloride and (-)-menthoxytitanium trichloride (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 2053-2064 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The copolymerization of isobutyl vinyl ether with indene was carried out with (-)-menthoxyaluminium dichloride (1) and (-)-menthoxytitanium trichloride (2) as initiators. Although optically active copolymers were obtained in the copolymerization in non-polar solvents, the copolymers prepared in a polar solvent was optically inactive. From the linear relationship between the optical rotation and the diad probability P2 (m1 m2) of the copolymers, it was found that asymmetric carbon atoms were introduced in vinyl ether monomeric units but not in indene ones.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1984.021851001
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Asymmetric induction in the copolymerization of (-)-3-(β-styryloxy)menthane with styrene (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 455-462 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Asymmetric induction in the copolymerization of (-)-3-(β-styryloxy)menthane (1) with styrene was investigated. The copolymers obtained in the presence of BF3 · OEt2 are optically active. The absolute value of the specific rotation of the copolymers was found to be higher than that of the homopolymeric mixture, whatever the composition. After ether cleavage reaction of the copolymers, the products are still optically active. The result suggests that an asymmetric induction takes place in the polymer main chain.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021840301
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Chemical synthesis of (1 → 2)-α-D-mannopyranan (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 297-309 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The polymerization of 1,2-anhydro-3,4,6-tri-O-benzyl-β-D-mannopyranose proceeds in the presence of Lewis acids, cationic coordination catalysts, and strong bases. Debenzylation of the products yields oligomeric saccharides or low polymers. Polymerization in toluene by means of potassium alkoxide complexed with crown ethers leads to essentially stereoregular (1 → 2)-α-D-mannopyranan. The original derivatives have been characterized by optical rotation, viscosity, molecular weight, gel permeation chromatography, and spectrometry. The free polysaccharides have been characterized by optical rotation, molecular weight, and 1H- and 13C-nmr spectrometry and compared to yeast mannan hydrolysate oligomers.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1980.360190208
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