AUene-Olefin and Allene-Allene Cycloadditions

AUene-Olefin and Allene-Allene Cycloadditions
Methylenecyclobutane and 1,2-Dimethylenecyclobutane
Degenerate Rearrangements
Prof. J. E. Baldwin and Mr. R. H. Fleming
Department of Chemistry, University of Oregon, Eugene, O R 97403, USA
Contents
I. Introduction 281
II. Allene-Olefin Cycloadditions 282
I I I . Methylenecyclobutane Rearrangements 286
IV. Allene-Allene Cycloadditions 288
V. 1,2-Dimcthylenecyclobutane Rearrangements . 294
VI. Molecular Orbital Calculations 297
VII. Concertedness . 300
V I I I . Discussion and Conclusions . 304
I X . References
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