Formation of lactones via a radical ring closure mechanism

1986 ◽  
pp. 85 ◽  
Author(s):  
Athelstan L. J. Beckwith ◽  
Paul E. Pigou
Keyword(s):  
Ring Closure ◽  
Radical Ring ◽  
Closure Mechanism

scholarly journals Rules for Anionic and Radical Ring Closure of Alkynes

2011 ◽  
Vol 133 (32) ◽  
pp. 12608-12623 ◽  
Author(s):  
Igor V. Alabugin ◽  
Kerry Gilmore ◽  
Mariappan Manoharan
Keyword(s):  
Ring Closure ◽  
Radical Ring

Regio- and stereo-selectivity of alkenyl radical ring closure: A theoretical study

Tetrahedron ◽  
1985 ◽  
Vol 41 (19) ◽  
pp. 3925-3941 ◽  
Author(s):  
Athelstan L.J. Beckwith ◽  
Carl H. Schiesser
Keyword(s):  
Theoretical Study ◽  
Ring Closure ◽  
Radical Ring ◽  
Stereo Selectivity ◽  
Alkenyl Radical

Barrierless Reactions of Three Benzonitrile Radical Cations with Ethylene

2020 ◽  
Vol 73 (8) ◽  
pp. 705
Author(s):  
Oisin J. Shiels ◽  
P. D. Kelly ◽  
Stephen J. Blanksby ◽  
Gabriel da Silva ◽  
Adam J. Trevitt
Keyword(s):  
Ion Trap ◽  
Radical Cations ◽  
Branching Ratios ◽  
Ring Closure ◽  
Van Der Waals Complexes ◽  
Rate Coefficients ◽  
Ion Trap Mass Spectrometry ◽  
Closure Mechanism ◽  
Product Ions ◽  
Product Branching

Reactions of three protonated benzonitrile radical cations with ethylene are investigated. Product branching ratios and reaction kinetics, measured using ion-trap mass spectrometry, are reported and mechanisms are developed with support from quantum chemical calculations. Reactions proceed via pre-reactive van der Waals complexes with no energy barrier (above the reactant energy) and form radical addition and addition–elimination product ions. Rate coefficients are 4-dehydrobenzonitrilium: 1.72±0.01×10−11 cm3 molecule−1 s−1, 3-dehydrobenzonitrilium: 1.85±0.01×10−11 cm3 molecule−1 s−1, and 2-dehydrobenzonitrilium: 5.96±0.06×10−11 cm3 molecule−1 s−1 (with±50% absolute uncertainty). A ring-closure mechanism involving the protonated nitrile substituent is proposed for the 2-dehydrobenzonitrilium case and suggests favourable formation of the protonated indenimine cation.

ChemInform Abstract: FORMATION OF SOME BICYCLIC SYSTEMS BY RADICAL RING-CLOSURE

1981 ◽  
Vol 12 (46) ◽  
Author(s):  
A. L. J. BECKWITH ◽  
G. PHILLIPOU ◽  
A. K. SERELIS
Keyword(s):  
Ring Closure ◽  
Radical Ring
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