Quenching by hydrogen bromide of the Norrish type II process in the photolysis of 2-pentanone. Chemical trapping of a triplet 1,4 biradical in the gas phase

1974 ◽  
Vol 96 (11) ◽  
pp. 3351-3358 ◽  
Author(s):  
H. E. O'Neal ◽  
R. G. Miller ◽  
E. Gunderson
Keyword(s):  
Gas Phase ◽  
Hydrogen Bromide ◽  
Type Ii ◽  
Chemical Trapping ◽  
Norrish Type

Formate Ester Norrish Type II Elimination:  Diode Laser Probing of Gas-Phase Yields

1996 ◽  
Vol 118 (17) ◽  
pp. 4181-4187 ◽  
Author(s):  
Yuping Niu ◽  
Elizabeth Christophy ◽  
Patrick J. Pisano ◽  
Ying Zhang ◽  
Jeanne M. Hossenlopp
Keyword(s):  
Gas Phase ◽  
Diode Laser ◽  
Type Ii ◽  
Laser Probing ◽  
Norrish Type

Temperature Dependent Solvent Effects in Photochemistry of 1-Phenylpentan-1-ones

1999 ◽  
Vol 64 (12) ◽  
pp. 2007-2018 ◽  
Author(s):  
Petr Klán ◽  
Jaromír Literák
Keyword(s):  
Solvent Effects ◽  
Solvent Polarity ◽  
Structure Change ◽  
Type Ii ◽  
Temperature Dependent ◽  
Methyl Derivative ◽  
Methyl Substitution ◽  
Weak Bases ◽  
Norrish Type ◽  
Small Structure

Temperature dependent solvent effects have been investigated on the Norrish Type II reaction of 1-phenylpentan-1-one and its p-methyl derivative. Efficiencies of the photoreaction were studied in terms of solvent polarity and base addition as a function of temperature. Such a small structure change as the p-methyl substitution in 1-phenylpentan-1-one altered the temperature dependent photoreactivity in presence of weak bases. The experimental results suggest that the hydrogen bonding between the Type II biradical intermediate OH group and the solvent is weaker for 1-(4-methylphenyl)pentan-1-one than that for 1-phenylpentan-1-one at 20 °C but the interactions probably vanish in both cases at 80 °C.

Catalysis by hydrogen halides in the gas phase. XIX. 2,3-Dimethylbutan-2-ol and hydrogen bromide

1968 ◽  
Vol 21 (10) ◽  
pp. 2385 ◽  
Author(s):  
RL Johnson ◽  
VR Stimson
Keyword(s):  
Gas Phase ◽  
Arrhenius Equation ◽  
Hydrogen Bromide ◽  
Phase Decomposition ◽  
Hydrogen Halides ◽  
First Order

The gas-phase decomposition of 2,3-dimethylbutan-2-ol into 2,3-dimethylbut-1-ene, 2,3-dimethylbut-2-ene, and water, catalysed by hydrogen bromide at 303-400�, is described. The rate is first-order in each reactant and the Arrhenius equation k2 = 1011.88 exp(-26490/RT) sec-l ml mole-1 is followed. The olefins appear to be in their equilibrium proportions. The effects of substitutions in the alcohol at Cα and Cβ on the rate are discussed.

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