Decomposition of cis and trans-2,3- and -2,4-dimethylcyclobutanones from the Vibrationally Excited Ground States. Thermal and Photochemical Activation

1972 ◽  
Vol 94 (21) ◽  
pp. 7235-7241 ◽  
Author(s):  
John Metcalfe ◽  
Howard Carless ◽  
Edward Lee
Keyword(s):  
Ground States ◽  
Vibrationally Excited ◽  
Cis And Trans ◽  
Photochemical Activation

Photochemical studies of unimolecular processes V. The photolysis and quenching of cis- and trans hexa-1, 3, 5-triene and of cyclohexa-1, 3-diene

1974 ◽  
Vol 337 (1609) ◽  
pp. 243-256 ◽  
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Pressure Dependence ◽  
Experimental Error ◽  
Internal Conversion ◽  
Vibrationally Excited ◽  
Excited Molecules ◽  
Cis And Trans ◽  
Low Pressures

The photolyses of cis- and trans -hexa-1, 3, 5-triene at wavelengths of 228.8 and 253.7 nm and of cyclohexa-1, 3-diene at 265.4 and 280.4 nm have been studied in the gas phase at various pressures and in the presence of added gases. At low pressures, the limiting quantum yield for hexatriene photolysis is unity within experimental error, and it is shown that the pressure dependence of all the observed interconversions of C 6 H 8 isomers and of benzene formation can be explained by reactions of vibrationally excited molecules produced by very rapid internal conversion.

Infrared Chemiluminescence from the Reaction of Oxygen Atoms with Chloroethylenes

1974 ◽  
Vol 52 (14) ◽  
pp. 2608-2612 ◽  
Author(s):  
S. J. Arnold ◽  
G. H. Kimbell ◽  
D. R. Snelling
Keyword(s):  
Initial Step ◽  
Reaction Step ◽  
Vibrationally Excited ◽  
Cis And Trans ◽  
Oxygen Atoms

Infrared chemiluminescence from vibrationally excited CO and from vibrationally excited HCl was observed when C2H3Cl, 1,1-C2H2Cl2, cis- and trans-1,2-C2H2Cl2, or C2HCl3 was introduced into a stream of oxygen atoms. The mechanisms describing the reactions of oxygen atoms with these molecules are discussed in detail. The initial step is postulated to involve the formation of an aldehyde and a carbene. The reaction step responsible for the formation of CO† is postulated to be[Formula: see text]and for HCl†[Formula: see text]

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