Conrotatory

In a conrotatory mode of an electrocyclic reaction (a class of organic chemical reactions) the substituents located at the termini of a conjugated double bond system move in the same (clockwise or counter clockwise) direction during ring opening or ring closure.

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example: example: upon heating cis-3,4-dimethylcyclobutene converts exclusively to trans,cis-2,4-hexadiene whereas trans-3,4-dimethylcyclobutene yields trans,cis-2,4-hexadiene.

opposite to disrotatory

References

• Carey, Francis A.; Sundberg, Richard J.; (1984). Advanced Organic Chemistry Part A Structure and Mechanisms (2nd ed.). New York N.Y.: Plenum Press. ISBN 0-306-41198-9.