Regioselective photoisomerizations of bridgehead substituted dibenzobarrelenes and benzonorbornadienes. The implication of excited-state secondary deuterium isotope effects of benzo-vinyl bridging

1982 ◽  
Vol 47 (23) ◽  
pp. 4597-4599 ◽  
Author(s):  
Leo A. Paquette ◽  
Elliott Bay
Keyword(s):  
Excited State ◽  
Isotope Effects ◽  
Deuterium Isotope Effects

Deuterium isotope effects on the ligand field excited-state kinetics of hexaamminerhodium(III)

1985 ◽  
Vol 24 (7) ◽  
pp. 1033-1035 ◽  
Author(s):  
Mark E. Frink ◽  
Peter C. Ford
Keyword(s):  
Excited State ◽  
Isotope Effects ◽  
Ligand Field ◽  
Deuterium Isotope Effects ◽  
Kinetics Of

Mechanism of hydration and isomerisation of 4-ethylidene-2,6-di-tert-butyl-2,5-cyclohexadien-1-one. Kinetics, acid-base catalysis and solvent deuterium isotope effects

1979 ◽  
Vol 44 (1) ◽  
pp. 110-122 ◽  
Author(s):  
Jiří Velek ◽  
Bohumír Koutek ◽  
Milan Souček
Keyword(s):  
Aqueous Medium ◽  
Rate Equation ◽  
Kinetic Data ◽  
Isotope Effects ◽  
Base Catalysis ◽  
Quinone Methide ◽  
Reaction Products ◽  
Acid Base ◽  
Deuterium Isotope Effects ◽  
Hydroxybenzyl Alcohol

Competitive hydration and isomerisation of the quinone methide I at 25 °C in an aqueous medium in the region of pH 2.4-13.0 was studied spectrophotometrically. The only reaction products in the studied range of pH are 4-hydroxybenzyl alcohol (II) and 4-hydroxystyrene (III). The form of the overall rate equation corresponds to a general acid-base catalysis. The mechanism of both reactions for three markedly separated pH regions is discussed on the basis of kinetic data and solvent deuterium effect.

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