Products, kinetics, and mechanism in the acetolysis of 2,3-dichloro-2,3-dihydrobenzofuran. An E1 elimination with a rate-determining proton transfer

1979 ◽  
Vol 44 (1) ◽  
pp. 32-34 ◽  
Author(s):  
Enrico Baciocchi ◽  
Sergio Clementi ◽  
Giovanni V. Sebastiani ◽  
Renzo Ruzziconi
Keyword(s):  
Proton Transfer ◽  
Kinetics And Mechanism

scholarly journals Kinetics and Mechanism of the Proton Transfer to Cp*Fe(dppe)H:  Absence of a Direct Protonation at the Metal Site

2003 ◽  
Vol 125 (36) ◽  
pp. 11106-11115 ◽  
Author(s):  
Natalia V. Belkova ◽  
Pavel O. Revin ◽  
Lina M. Epstein ◽  
Evgenii V. Vorontsov ◽  
Vladimir I. Bakhmutov ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Kinetics And Mechanism ◽  
Metal Site

Kinetics and mechanism of proton transfer reactions from NH acid to 1,2-bis(dialkylaminomethyl)benzene in acetonitrile

1995 ◽  
Vol 344 (1-2) ◽  
pp. 89-94 ◽  
Author(s):  
Grzegorz Schroeder ◽  
Bogumił Brzezinski ◽  
Arnold Jarczewski ◽  
Eugeniusz Grech ◽  
Joanna Nowicka-Scheibe
Keyword(s):  
Proton Transfer ◽  
Kinetics And Mechanism ◽  
Transfer Reactions ◽  
Proton Transfer Reactions

THE WALLACH REARRANGEMENT: PART II. KINETICS AND MECHANISM OF THE ACID-CATALYZED REARRANGEMENT OF AZOXYBENZENE

1965 ◽  
Vol 43 (4) ◽  
pp. 862-875 ◽  
Author(s):  
E. Buncel ◽  
B. T. Lawton
Keyword(s):  
Sulfuric Acid ◽  
Proton Transfer ◽  
Acid Concentration ◽  
Entire Range ◽  
Kinetics And Mechanism ◽  
The Other ◽  
Rate Data ◽  
Spectrophotometric Methods ◽  
Aqueous Sulfuric Acid ◽  
Acid Catalyzed

The rate of rearrangement of azoxybenzene to p-hydroxyazobenzene has been measured in 75.3–96.4% sulfuric acid at 25° and in 65.0–90.4% sulfuric acid at 75.5° by spectrophotometric methods. The pKa of azoxybenzene in aqueous sulfuric acid has also been determined. It is found that although azoxybesssnzene is almost completely protonated over the entire range of acid concentration studied, the rate increases by more than 1 000-fold. A two-proton process is therefore indicated and mechanisms are proposed involving a dication (II) as the key intermediate. The rate data do not allow differentiation between two proposed mechanisms, one involving two equilibrium protonations, and the other a single equilibrium protonation followed by rate-determining proton transfer. Past mechanisms of the Wallach rearrangement are discussed.

Kinetics and mechanism of the addition of dimethylarsine to hexafluorobutyne-2

1969 ◽  
Vol 47 (12) ◽  
pp. 2137-2143 ◽  
Author(s):  
W. R. Cullen ◽  
W. R. Leeder
Keyword(s):  
Activation Energy ◽  
Proton Transfer ◽  
Product Distribution ◽  
Second Order ◽  
Kinetics And Mechanism ◽  
Activation Entropy ◽  
Kcal Mole ◽  
Competitive Reaction ◽  
Intermolecular Proton Transfer

The addition of dimethylarsine to hexafluorobutyne-2 follows second order kinetics with activation energy, 6.09 ± 0.20 kcal/mole, and activation entropy, −48 ± 1 e.u. The product distribution of the competitive reaction of dimethylarsenic deuteride and diethylarsine with the acetylene shows that the addition mainly involves an intermolecular proton transfer. The mechanism of the addition is discussed.

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