Description:Scheme 2.18: Tandem Claisen-Cope reaction versus alkene isomerization. 26. Scheme Scheme 3.14: Tandem reaction control experiments. 45 .. maximizes pi overlap are over four angstroms apart (see 3D structure 1.22a, scheme 1.3). While the 9 Sgarbi, P.W.M.; Clive, D.L.J. Chem. Commun.