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.

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.

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.

Normal coordinate analysis of infrared and Raman spectra of syndiotactic poly(methyl methacrylate)

1991 ◽  
Vol 56 (8) ◽  
pp. 1653-1661 ◽  
Author(s):  
Jiří Dybal
Keyword(s):  
Methyl Methacrylate ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Single Chain ◽  
Normal Coordinate ◽  
Energy Distributions ◽  
Poly Methyl Methacrylate ◽  
Branched Hydrocarbons ◽  
Backbone Structure ◽  
Calculated Potential Energy

Infrared and Raman spectra of crystalline syndiotactic poly(methyl methacrylate) have been analyzed by normal coordinate calculations, using a combined valence force field transferred from branched hydrocarbons and from methyl acetate. Calculations have been done for a single chain all-trans backbone structure of syndiotactic poly(methyl methacrylate) with parallel and antiparallel side-group orientations. The infrared and Raman bands observed can be satisfactorily interpreted on the basis of the calculated potential energy distributions. The best agreement between the calculated and experimental spectra has been found for the alternate cis and trans mutual orientations of the C=O and C-CH3 bonds in subsequent monomeric units.

Darstellung und spektroskopische Untersuchung von Trimethoxysilylpropylsulfanen / Synthesis and Spectroscopy of Silylsulfanes

1979 ◽  
Vol 34 (6) ◽  
pp. 790-793 ◽  
Author(s):  
Wolfgang Buder
Keyword(s):  
Raman Spectra ◽  
Nmr Spectra ◽  
Infrared And Raman Spectra ◽  
C Nmr

Abstract The preparation of the sulfanes [(CH3O)3Si-(CH2)2-]2Sn (n=1-4) 2-5 and the corresponding mercaptane 1 is communicated. The 1H and 13C NMR spectra of 1-5 are reported and discussed. The infrared and Raman spectra are discussed in view of C-S-and S-S-bonding.

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.

(S)-2,2,5,5-Tetramethylthiazolidine-4-carboxylic acid: a compound which exists in the amino acid rather than the zwitterion form

1985 ◽  
Vol 63 (9) ◽  
pp. 2411-2419 ◽  
Author(s):  
Helen Elaine Howard-Lock ◽  
Colin James Lyne Lock ◽  
Philip Stuart Smalley
Keyword(s):  
Amino Acid ◽  
Carboxylic Acid ◽  
Raman Spectra ◽  
Cooh Group ◽  
Infrared And Raman Spectra ◽  
Acid Form ◽  
Hydrogen Atoms ◽  
Cell Dimensions ◽  
Amino Acid Form ◽  
C Nmr

The X-ray crystal structure of (S)-2,2,5,5-tetramethylthiazolidine-4-carboxylic acid, 1, has been determined. Crystals are monoclinic, P21, with cell dimensions a = 11.351(4) b = 8.303(2), c = 11.969(3) Å, β = 116.69(2)°, and Z = 4. The structure was solved by standard methods and refined to R1 = 0.0774, R2 = 0.0670 for 2388 independent reflections. Compound 1 exists in the amino-acid form as shown by two distinctly different C—O bond lengths, 1.209 and 1.309 Å, typical of the COOH group, and by the positions of the hydrogen atoms. The amino-acid form of 1 found in the solid also exists in solution as shown by infrared and Raman spectra. The mass spectra, and 1H and 13C nmr spectra are reported, as well as detailed infrared and Raman spectra for the title compound and several deuterated species.

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
Sign in / Sign up

Export Citation Format

Share Document