Zobrazeno 1 - 10
of 68
pro vyhledávání: '"H. Pivcová"'
Publikováno v:
Journal of Polymer Science Part C: Polymer Symposia. 22:1093-1100
Publikováno v:
Journal of Polymer Science Part C: Polymer Symposia. 23:365-372
NMR spectra of the meso and d,l isomers of methyl-2,4-pentanedicarboxylate and of isotactic, heterotactic, and syndiotactic methyl-2,4,6-heptanetricarboxylate have been measured and analyzed. From the values of vicinal coupling constants the energy d
Publikováno v:
Journal of Polymer Science: Polymer Symposia. 40:283-295
Infrared spectra of 2,2′-alkylidene, 2,2′-thiobisphenols, and 2,2′-biphenyldiols have been measured in the range of the OH stretching vibrations. From these measurements the possible conformers present in dilute CCl4 solutions are proposed. A c
Autor:
J. Petránek, H. Pivcová, D. Lím, M. Kolinsky, Bohdan Schneider, Danica Doskočilová, Jan Štokr
Publikováno v:
Journal of Polymer Science Part C: Polymer Symposia. 16:215-228
The infrared and NMR spectra of syndiotactic, isotactic, and heterotactic 2,4,6-trichloroheptane, model compounds of poly(vinyl chloride), have been measured over a wide temperature range. Conformational structures of these stereoisomers have been de
Publikováno v:
Angewandte Makromolekulare Chemie. 80:149-160
The photooxidation of 2,6-di-tert-butyl-4-hydroperoxy-4-methyl-2,5-cyclohexadiene-1-one (I) in heptane with oxygen at wave-lengths larger than 355 nm proceeds through a low stable 4-acetyl-2,5-di-tert-butyl-2-hydroperoxy-3-cyclopentene-1-one (II). Th
Publikováno v:
Journal of Polymer Science: Polymer Chemistry Edition. 12:1983-1990
1,2,2,2-Tetrachloroethyl esters of β-vinylacrylic, muconic, and fumaric acids were prepared by the addition reaction of chloral with pentadienoyl chloride, hexadienedioyl chloride, and fumaroyl chloride in the presence of FeCl3. The homopolymer of t
Publikováno v:
Collection of Czechoslovak Chemical Communications. 52:1922-1927
By reacting p-nitrophenyl esters of L-α-amino acids with α-(3-aminopropyl)-ω-(aminomethyl)-poly(oxyethylene), diamides having the structure [X-NHCH(R)CONH]2Mx' were prepared, X being the protective group Boc or Z, R being residues of glutamic and
Publikováno v:
Journal of Inorganic Biochemistry. 24:13-24
Reaction mixtures of glycine or l-histidine with cis-[Pt(NH3)2Cl2], cyclobutane-1,1-dicarboxylatodiammine-Pt(II) and diammineethylmalonato-Pt(II) were analyzed by electrophoresis and 1H and 13C NMR spectroscopy. The reaction products derived from eac
Publikováno v:
Polymer. 28:991-997
In order to assess the manifestation of possible conformations of poly(amino acids) in 13C cross-polarization/magic angle spinning nuclear magnetic resonance (CP/MAS n.m.r.) spectra, the conformational structures of poly(α- l -glutamic acid) (poly(G
Publikováno v:
Biopolymers. 20:1605-1614
The structure of poly(aspartic acid) prepared by thermal polycondensation has been studied by means of nmr spectroscopy. The analysis of the 13C-nmr spectra of the polymer at various pH values and comparison with the spectrum of poly(α-L-aspartic ac