ChemInform Abstract: INFLUENCE OF THE STERIC REQUIREMENTS OF THE NUCLEOPHILE ON THE TRANSITION STATE STRUCTURE OF E2 REACTIONS. A KINETIC STUDY OF THE ELIMINATIONS FROM 1-BROMO-2-ARYLETHANES AND 1-CHLORO-1-PHENYL-2-ARYLETHANES PROMOTED BY SODIUM 2,6-DI-TE

1978 ◽  
Vol 9 (43) ◽  
Author(s):  
S. ALUNNI ◽  
E. BACIOCCHI ◽  
P. PERUCCI ◽  
R. RUZZICONI
Keyword(s):  
Transition State ◽  
Kinetic Study ◽  
State Structure ◽  
Transition State Structure

Hydride transfer reactions. A kinetic study of oxidation of 2- and 3-methoxy-N-methylacridans by some π acceptors and a one-electron oxidant

1984 ◽  
Vol 62 (9) ◽  
pp. 1780-1784 ◽  
Author(s):  
Allan K. Colter ◽  
Peter Plank ◽  
John P. Bergsma ◽  
Roy Lahti ◽  
André A. Quesnel ◽  
...  
Keyword(s):  
Transition State ◽  
Kinetic Study ◽  
Radical Cation ◽  
Hydride Transfer ◽  
Transfer Reactions ◽  
State Structure ◽  
Transition State Structure ◽  
Hydride Transfer Reactions ◽  
The One

Relative rates of oxidation of N-methylacridan (1a), 2-methoxy-N-methylacridan (1b), and 3-methoxy-N-methylacridan (1c) have been investigated as a probe of transition state structure in hydride transfer reactions. Oxidants investigated cover a 2 × 107-fold (with 1a) to 2 × 108-fold (with 1c) range of reactivity, and include the π acceptors 1,4-benzoquinone (BQ), p-chloranil (CA), 2,3-dicyano-1,4-benzoquinone (DCBQ), 7,7,8,8-tetracyanoquinodimethane (TCNQ), and tetracyanoethylene (TCNE) in acetonitrile (AN), BQ in 50:50 (v/v) AN–water, and the one-electron oxidant tris(2,2′-bipyridyl)cobalt-(III), [Formula: see text], in AN, all at 25 °C. For all of the π acceptors except TCNE the order of reactivity, 1c > 1b > 1a, (DH) indicates a transition state resembling the corresponding acridinium ion product (D+), while the order of reactivity with [Formula: see text], 1b > 1c > 1a, indicates a transition state resembling the acridan radical cation [Formula: see text]. The order of reactivity observed with TCNE, 1b > 1c > 1a, is tentatively interpreted as indicating a transition state resembling the corresponding 9-acridanyl radical (D•).

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