Abstract
Push-Pull Substituted Allenes, VIII. 1,2-Bismethylenecyclobutanes and Pyrano-pyrans: Dimers from Differently Substituted Donor/Acceptor Allenes Depending on the substituents donor/acceptor-substituted allenes dimerize to give two different classes of compounds: 1,1-diethoxy-3,3-bis(trifluoromethyl)allene (4) in a [2 + 2]-cyclodimerization gives 1,2-bismethylenecyclobutane 5 and 1,1-diethoxy-3-acylallene 13 dimerizes with substituent participation in a hetero Diels-Alder reaction and subsequent electrocyclic ring closure reaction to give pyrano 14.
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