... Tetrahedron. Volume 28, Issue 6, 1972, Pages 1485-1496. ... Download full text in PDF. Tetrahedron Vol. 28. pp. ... TT :c=c=c: P>=c=c: 28 29 31 SCHEME 9 triplet state.14 It should be noted that the trans-trans adduct (23) was obtained in the dilution experiments of cyclohexane. ...