Model compounds of poly(methyl methacrylate). Conformational structure of 2,2-dimethyl-1-methoxypropane and of the methyl ester of 3-methoxy-2,2-dimethylpropanoic acid

1983 ◽  
Vol 48 (11) ◽  
pp. 3050-3064 ◽  
Author(s):  
Bohdan Schneider ◽  
Danica Doskočilová ◽  
Jan Štokr ◽  
Jan Lövy ◽  
Martin Přádný ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Methyl Methacrylate ◽  
Nmr Spectra ◽  
Conformational Structure ◽  
Model Compounds ◽  
Poly Methyl Methacrylate ◽  
Major Form ◽  
C Nmr

By analysis of infrared, Raman and 13C NMR spectra of 2,2-dimethyl-1-methoxypropane and of the methyl ester of 3-methoxy-2,2-dimethylpropanoic acid, the formation of conformers generated by rotation about the CH2-OCH3 and C-CH2 bonds was studied. It was found that in both molecules, only the form with trans orientation of the C-CH2-O-CH3 bonds is present. The conformational structure of the major form of the methyl ester of 3-methoxy-2,2-dimethylpropanoic acid was proposed.

Model compounds of poly(methyl methacrylate). Conformational structure of methyl 3-methoxy-2-methylpropionate

1984 ◽  
Vol 49 (10) ◽  
pp. 2275-2284 ◽  
Author(s):  
Danica Doskočilová ◽  
Jan Štokr ◽  
Bohdan Schneider ◽  
Martin Přádný ◽  
Stanislav Ševčík
Keyword(s):  
Methyl Methacrylate ◽  
Raman Spectra ◽  
Nmr Spectra ◽  
Conformational Structure ◽  
Infrared And Raman Spectra ◽  
Model Compounds ◽  
Poly Methyl Methacrylate ◽  
C Nmr

By analysis of 1H and 13C NMR spectra, and of infrared and Raman spectra of methyl 3-methoxy-2-methylpropionate, the formation of conformers generated by rotation about the bonds CH3O-CH2, CH2-CH and C-C=O was studied. The structure of the most highly populated conformer is proposed.

Conformational structure of ethylene glycol dibenzoate. Vibrational and NMR spectra

1981 ◽  
Vol 46 (8) ◽  
pp. 1913-1929 ◽  
Author(s):  
Bohdan Schneider ◽  
Pavel Sedláček ◽  
Jan Štokr ◽  
Danica Doskočilová ◽  
Jan Lövy
Keyword(s):  
Ethylene Glycol ◽  
Vibrational Spectra ◽  
Nmr Spectra ◽  
Coupling Constants ◽  
Conformational Structure ◽  
Infrared And Raman Spectra ◽  
H Nmr ◽  
Liquid States ◽  
Crystalline Forms ◽  
C Nmr

It was found that three crystalline forms of ethylene glycol dibenzoate can be prepared. Infrared and Raman spectra of these three forms, as well as of the glassy and liquid states, were measured. From 3JHH coupling constants obtained by analysis of the 13C satellite band of the -CH2- group in 1H NMR spectra, and from the 3JCH coupling constants of the -CO.O.CH2- fragment obtained by analysis of the carbonyl band in 13C NMR spectra it was found that in the liquid state the -CH2-CH2- group exists predominantly in the gauche conformational structure, and the bonds C-O-C-C assume predominantly a trans orientation. The results of the analysis of NMR and vibrational spectra were used for the structural interpretation of conformationally sensitive bands in vibrational spectra of ethylene glycol dibenzoate.

13C NMR spectra of poly(methyl methacrylate) and poly(ethyl methacrylate)

1984 ◽  
Vol 117 (1-2) ◽  
pp. 109-115 ◽  
Author(s):  
Anton Neppel ◽  
Ian S. Butler
Keyword(s):  
Methyl Methacrylate ◽  
13C Nmr ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
Poly Methyl Methacrylate ◽  
Ethyl Methacrylate

Electrooxidation of 2-arylfurans

1981 ◽  
Vol 46 (4) ◽  
pp. 906-916 ◽  
Author(s):  
Miroslav Janda ◽  
Jan Šrogl ◽  
Hana Dvořáková ◽  
Dalimil Dvořák ◽  
Ivan Stibor
Keyword(s):  
Electronic Spectra ◽  
Nmr Spectra ◽  
Model Compounds ◽  
Methyl Group ◽  
C Nmr

Electrochemical methoxylation of 2-phenylfuran (I) and 2-(4-nitrophenyl)furan (VI) proceeded anomalously, affording 5-methoxy-2-phenylfuran (XI) and 5-methoxy-2-(4-nitrophenyl)furan (XIII), respectively. 2-Phenyl-5-methylfuran (II) and methyl-2-(2-methylphenyl)-3-furoate (VIII) behaved normally giving the respective 2,5-dimethoxy-2,5-dihydrofuran derivatives XII and XIV. The suggested ECNECB mechanism of the anomalous methoxylation was confirmed by methoxylation of compound II, in which the methyl group hinders the last CB step, and also of compound VIII in which the automaticity is suppressed by forced deviation from planarity. Forced deviation from planarity was moreover studied also on 2-(4-methylphenyl)furan (III), 5-methyl-2-(2-methylphenyl)furan (IV) and 3,5-dimethyl-2-(2-methylphenyl)furan (V) as model compounds. For all the derivatives the INDO charges were calculated and correlated with the 1H- and 13C-NMR spectra. The experimental electronic spectra were correlated with the theoretical ones (INDO-S-CI). All the results obtained confirm the suggested mechanism.

Conformational Structure and Stereocomplex Formation in Poly(methyl methacrylate)

1973 ◽  
Vol 6 (4) ◽  
pp. 511-513 ◽  
Author(s):  
M. Mihailov ◽  
S. Dirlikov ◽  
N. Peeva ◽  
Z. Georgieva
Keyword(s):  
Methyl Methacrylate ◽  
Conformational Structure ◽  
Poly Methyl Methacrylate ◽  
Stereocomplex Formation

Local molecular motion of polystyrene model compounds measured by picosecond pulse radiolysis. 3. Diastereomeric styrene dimer, trimer, and tetramer in poly(methyl methacrylate) solid solution

1990 ◽  
Vol 23 (6) ◽  
pp. 1686-1690 ◽  
Author(s):  
Hideyuki Itagaki ◽  
Kazuyuki Horie ◽  
Itaru Mita ◽  
Masakazu Washio ◽  
Seiichi Tagawa ◽  
...  
Keyword(s):  
Solid Solution ◽  
Methyl Methacrylate ◽  
Pulse Radiolysis ◽  
Molecular Motion ◽  
Picosecond Pulse ◽  
Model Compounds ◽  
Poly Methyl Methacrylate

Alkylated benzimidazole and benzotriazole derivatives of 3-amino-2-propenoic acid

1989 ◽  
Vol 54 (3) ◽  
pp. 713-724 ◽  
Author(s):  
Viktor Milata ◽  
Dušan Ilavský ◽  
Igor Goljer
Keyword(s):  
Hydrogen Atom ◽  
Nmr Spectra ◽  
Model Compounds ◽  
Methyl Group ◽  
Propenoic Acid ◽  
Independent Synthesis ◽  
Amino Derivatives ◽  
Derivatives Of ◽  
Benzotriazole Derivatives ◽  
C Nmr

The alkylation of unsubstituted 3-(5-benzimidazolyl- and 5-benzotriazolyl)amino derivatives of 2-propenoic acid (I) results in the replacement of hydrogen atom at the nitrogen of YZC=CH-NH- substituent (II-IV). The model compounds with a methyl group in the azole nucleus (V-VII) have been prepared by an independent synthesis. The structure of all products has been confirmed and confronted with their IR, UV, 1H and 13C NMR spectra.

Model compounds of poly(methyl methacrylate): conformational analysis

Polymer ◽  
1994 ◽  
Vol 35 (5) ◽  
pp. 1078-1083 ◽  
Author(s):  
M.A Mora ◽  
M.F Rubio-Arroyo ◽  
Roberto Salcedo
Keyword(s):  
Conformational Analysis ◽  
Methyl Methacrylate ◽  
Model Compounds ◽  
Poly Methyl Methacrylate

Study of the effect of aggregation on the structure of syndiotactic poly(methyl methacrylate) by infrared spectra of its deuterated analogues

1984 ◽  
Vol 49 (10) ◽  
pp. 2259-2268 ◽  
Author(s):  
Jiří Dybal ◽  
Bohdan Schneider ◽  
Marian Mihailov
Keyword(s):  
Methyl Methacrylate ◽  
Infrared Spectra ◽  
Main Chain ◽  
Chain Conformation ◽  
Conformational Structure ◽  
Poly Methyl Methacrylate ◽  
Carbon Backbone ◽  
Temperature Trends ◽  
Extended Chain ◽  
Vibrational Bands

The temperature trends of the infrared spectra of the films of some specifically deuterated analogues of syndiotactic poly(methyl methacrylate) were measured and vibrational bands sensitive to the conformational structure of the carbon backbone and to the orientation of ester groups with respect to the main chain were determined. Analysis of the spectra has confirmed that aggregated syndiotactic poly(methyl methacrylate) contains a higher population of diads in the extended chain conformation in long syndiotactic sequences as compared to the nonaggregated polymer, and has shown that in the aggregate, ordering of ester groups also takes place.

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