electrocyclic reaction

(redirected from Electrocyclic)

electrocyclic reaction

[i‚lek·trō¦sī·klik rē′ak·shən]
(physical chemistry)
The interconversion of a linear π-system containing n π-electrons and a cyclic molecule containing (n-2) π-electrons which is formed by joining the ends of the linear molecule.
References in periodicals archive ?
Ayub, Theoretical insights into thermal cyclophanediene to dihydropyrene electrocyclic reactions; a comparative study of Woodward Hoffmann allowed and forbidden reactions, J.
Ayub, Quantum mechanical investigation on acceleration of electrocyclic reactions through transition metal catalysis, J.
Finally, electrocyclic ring closure and a subsequent [1,3]-H migration leads to the formation of isoquinoline isomers.
Thermal and photochemical interconversion among [C.sub.4][H.sub.6] isomers 22-24 is one of the most fundamental electrocyclic reactions, and hence, has been investigated in detail including its stereochemistry (Scheme 3).
Among their topics are cycloaddition reactions, sigmatropic rearrangements and related processes promoted by silver, silver(I)-mediated electrocyclic processes, cycloisomerization reactions catalyzed by silver, silver carbenoids, aldol and related processes, coupling reactions promoted by silver, the supramolecular chemistry of silver, and a critical comparison of the three coinage metals.
Resin cure chemistry is dominated by `ene' reactions (otherwise known as pericyclic or electrocyclic reactions).
Specific projects can range from the stereospecific synthesis of leukotriene metabolites and the development of new synthetic methods in electrocyclic reactions, radical chemistry, thioethers and carbohydrate chemistry to the development of innovative analytical methods for measuring drugs and their metabolites in biological tissues and fluids.
Appel's dehydration conditions of (2-oxo-1,2-diphenylethylidene)hydrazono)-N-phenylbutanamide 41, prepared from reaction of benzil hydrazone with acetoacetanilide, led to azinoketimine 42 which underwent electrocyclic ring closure under the reaction conditions to give imidazo[1,2-b]pyrazole-2-one 49 and 1H-imidazo[1,2-fr]pyrazole 50 [40] (Scheme 9).