Polymerization of chloroprene. Part 4.—Influence of oxygen on the thermal reactions

1970 ◽  
Vol 66 (0) ◽  
pp. 421-426 ◽  
Author(s):  
J. R. Ebdon ◽  
R. S. Lehrle ◽  
J. C. Robb
Keyword(s):  
Thermal Reactions

THE KINETICS OF THE THERMAL REACTIONS OF ETHYLENE OXIDE

1963 ◽  
Vol 41 (12) ◽  
pp. 2956-2961 ◽  
Author(s):  
M. Lynne Neufeld ◽  
Arthur T. Blades
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Ethylene Oxide ◽  
Thermal Reactions ◽  
Kinetics Of

The thermal reactions of ethylene oxide in the presence of an excess of propylene have been studied as a function of pressure and it has been found that there are two sets of products, acetaldehyde and free radicals, presumably methyl and formyl. These products are believed to arise from an excited acetaldehyde intermediate. Some evidence has been obtained for the occurrence of a surface-catalyzed rearrangement to acetaldehyde but the free radical products are uninfluenced by surface.

The photoaddition of 1,3-diketonatoboron difluorides with benzene derivatives

1991 ◽  
Vol 69 (3) ◽  
pp. 423-431 ◽  
Author(s):  
Yuan L. Chow ◽  
Xinxin Ouyang
Keyword(s):  
Crystallographic Analysis ◽  
Secondary Oxidation ◽  
Enol Ethers ◽  
X Ray ◽  
Thermal Reactions ◽  
Secondary Reactions ◽  
Enol Acetates ◽  
Orthogonal Orientation ◽  
Acid Catalyzed ◽  
Boron Difluoride

The boron difluoride complexes of 2-acetylcyclohexanone, 2-acetylcyclopentanone, and acetylacetone (abbreviated as ACHBF2, ACPBF2, and AABF2) were irradiated in the presence of benzene to give the 1:1 adducts as the primary photoadducts; for certain BF2 complexes, toluene, chlorobenzene, benzonitrile, and methyl benzoate were also used as substrates. The 1,5-diketone photoadducts were assumed to form by a [2+2] photocycloaddition followed by cyclobutane opening and hydrolysis to give 1,2 adducts. They undergo a variety of secondary thermal reactions, probably acid catalyzed, to give enol ethers, enol acetates, acetophenones, and ketonylacetophenones. The efficiency of these secondary reactions determines the final products. Photoaddition with a monosubstituted benzene preferentially occurs at the 3,4 bond without regioselectivity. Under oxygen, ACHBF2 photolytically reacts with benzene to give a secondary oxidation product of a 10-membered cyclic alkylphe-none, which is proven by X-ray crystallographic analysis to have the benzene ring and carbonyl group in orthogonal orientation. It is shown that the singlet excited state ACHBF2 initiates the photoaddition, probably through the formation of the benzene exciplex, which could be detected by its emission. While the Stern–Volmer rates are small, the quantum yield of photoaddition products is as high as 0.12–0.19 under limiting conditions. Key words: [2+2] photocycloaddition, non-planar alkanophenone, macrocyclic alkanophenone, boron difluoride complexes, photoaddition to benzenes.

Thermal reactions of allophane under applied electric fields

1985 ◽  
Vol 84 ◽  
pp. 111-122 ◽  
Author(s):  
R.M. Berezowski ◽  
K.J.D. Mackenzie
Keyword(s):  
Electric Fields ◽  
Thermal Reactions

The thermal reactions of CH3

1994 ◽  
Vol 25 (1) ◽  
pp. 713-719 ◽  
Author(s):  
K.P. Kim ◽  
J.V. Michael
Keyword(s):  
Thermal Reactions

Syntheses and thermal reactions of 2-alkyl(or aryl)-1-benzoyl-3,4-dihydro-2-thianaphthalenes

1981 ◽  
Vol 22 (37) ◽  
pp. 3629-3632 ◽  
Author(s):  
Mikio Hori ◽  
Tadashi Kataoka ◽  
Hiroshi Shimizu ◽  
Akihiko Tomoto
Keyword(s):  
Thermal Reactions

ChemInform Abstract: PHOTOCHEMICAL AND THERMAL REACTIONS OF HEXAFLUOROBUTADIENE WITH SUBSTITUTED STYRENES

1981 ◽  
Vol 12 (40) ◽  
Author(s):  
N. B. KAZ'MINA ◽  
E. I. MYSOV ◽  
M. YU. ATIPIN ◽  
A. J. AKHMEDOV ◽  
YU. T. STRUCHKOV
Keyword(s):  
Thermal Reactions

Some Thermal Reactions of Perfluoroalkyl Derivatives of SF6with Fluorocarbon Olefins1

1958 ◽  
Vol 80 (12) ◽  
pp. 3007-3009 ◽  
Author(s):  
R. D. Dresdner ◽  
T. J. Mao ◽  
J. A. Young
Keyword(s):  
Thermal Reactions ◽  
Derivatives Of
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