Coumarin and related compounds. Part VIII. Aluminium chloride-catalysed reactions of phenols with methyl methacrylate. A ready synthesis of 6-methylfuro[3,2-g]coumarin and 7-hydroxy-3-methyl-coumarin

1969 ◽  
pp. 1749 ◽  
Author(s):  
Arum K. Das Gupta ◽  
Rabindra M. Chatterje ◽  
Kaustubh R. Das
Keyword(s):  
Methyl Methacrylate ◽  
Aluminium Chloride ◽  
Related Compounds

Organic and biological spectrochemical studies. XXV. Properties of the p-bis(methylthio)benzene and p-bis(ethylthio)benzene cation radicals

1968 ◽  
Vol 46 (2) ◽  
pp. 317-323 ◽  
Author(s):  
W. F. Forbes ◽  
P. D. Sullivan
Keyword(s):  
Aluminium Chloride ◽  
Molecular Orbital Calculations ◽  
Trans Isomers ◽  
Cation Radicals ◽  
Oxygen Analog ◽  
Cis And Trans Isomers ◽  
Spin Resonance ◽  
Cis And Trans ◽  
Related Compounds ◽  
Spin Densities

The electron spin resonance spectra of the sulfur analogs of the p-dimethoxy and p-diethoxy benzene cation radicals, i.e. the cation radicals of p-bis(methylthio)benzene (1) and p-bis(ethylthio)benzene (2), were investigated in aluminium chloride – nitromethane. The spectra are interpreted in terms of cis–trans isomerism. Empirical molecular orbital calculations support this assignment and yield qualitatively correct spin densities at the ring positions. Comparison of the spectral properties of these species with corresponding compounds containing oxygen atoms indicates changes which can be associated with the greater tendency of the sulfur atom to attract spin density. There is also evidence from the β-alkyl proton splitting constants that the conformation of the radical of 2 differs from that of its oxygen analog. Slightly different g values are again observed for the cis and trans isomers, as previously noted for related compounds.

Infra-Red Spectra of Rubber and High Polymers

1941 ◽  
Vol 14 (3) ◽  
pp. 572-579
Author(s):  
W. C. Sears
Keyword(s):  
Methyl Methacrylate ◽  
Fair Agreement ◽  
Chain Molecules ◽  
Rubber Industry ◽  
Vulcanized Rubber ◽  
Gutta Percha ◽  
Infra Red ◽  
Related Compounds ◽  
Long Chain ◽  
High Polymers

Abstract The rubber industry is interested in all methods for studying the structure of highly polymerized substances. Infra-red spectroscopy has been recognized by recent workers as a possible means for determining the valence forces in long chain molecules. Accordingly, the infra-red spectra of rubber and related compounds have been measured by several workers. An investigation of rubber, gutta percha, indene, polyindene, styrene, polystyrene, polyvinylacetate and polyvinylchloracetate has been carried out by Stair and Coblentz. Later Williams measured natural and vulcanized rubber, rubber hydrochloride, isoprene, styrene and polymerized butadiene in the region between 2.5µ and 9µ, but his spectra of rubber did not agree with that of Stair and Coblentz. Williams and Taschek reported that the bands in rubber become broader with increasing stretch. Recently a rough survey of the infra-red transmission of rubber, Pliofilm, Vinylite XYSG, Shawinigan V-15, polystyrene, methyl methacrylate polymer and Cellophane has been made by Wells. The Raman data of rubber obtained by Gehman and Osterhof are in fair agreement with the infra-red results of Stair and Coblentz.

Kinetics of alternating copolymerization of styrene with methyl methacrylate in the presence of diethyl aluminium chloride

1980 ◽  
Vol 22 (12) ◽  
pp. 3057-3062 ◽  
Author(s):  
Ye.V Ignatova ◽  
M.B Lachinov ◽  
V.P Zubov ◽  
Ye.S Garina ◽  
V.A Kabanov
Keyword(s):  
Methyl Methacrylate ◽  
Aluminium Chloride ◽  
Alternating Copolymerization ◽  
Kinetics Of
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