Abstract
Processes for dimerisation of olefins are briefly outlined and the syntheses of cyclobutanes by various photochemical, metal-catalysed, and cation-radical induced dimerisations of mono-olefins are described. 1. General Remarks 2. Cyclobutanes from Photochemical Cyclodimerisation of Olefins 2.1. Simple Olefins 2.2. Monocyclic Olefins 2.3. Polycyclic Olefins and Non-Conjugated Dienes 2.4. Vinyl Derivatives of Aromatic Compounds 2.5. Monocyclic Olefins 3. Cyclobutanes from Metal-Catalysed Cyclodimerisation of Olefins 4. Cyclobutanes from Cyclodimerisation of Olefins via Cation-Radical Intermediates

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