2+2 CYCLO ADDITION OPTICALLY ACTIVE OR THERMALLY ACTIVE.

Answer Posted / slyos

If the process involves 4n electrons and is realised in a
conrotatory maner, then it is thermally favored.

Therefore the basic rule: 4n Thermic Conroratory

a 4n+2 electrons process will then necessarly be
Photochemically favored in a conrotatory way or thermically
favored in a disrotatory way.

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