Selected contents: Ene Reactions. Ene reactions with alkenes as enophiles. Metallo-ene reactions. [2 + 2] Cycloadditions. Thermal cyclobutane ring formation. Formation of four-membered heterocycles. Di-&pgr;-methane photoisomerizations. Oxa-di-&pgr;-methane photoisomerizations. [3 + 2] Cycloadditions. Thermal cycloadditions. Transition metal mediated cycloadditions. [4 + 2] Cycloadditions. Intermolecular Diels-Alder reactions. Retrograde Diels-Alder reactions. Higher-Order Cycloadditions. [4 + 3] cycloadditions. [4 + 4] and [6 + 4] cycloadditions. [3 + 2] and [5 + 2] arene-alkene photocyloadditions. Electrocyclic Processes. Cyclobutene ring opening reactions. 1,3-cyclohexadiene formation reactions. Nazarov and related cationic cyclizations. Sigmatropic Processes. Cope, oxy-cope and anionic oxy-cope rearrangements. Claisen rearrangements. Consecutive rearrangements. Small-Ring Rearrangements. Rearrangements of vinylcyclopropanes and related systems. Charge-accelerated rearrangements. Other Transition Metal Associated Reactions. The Pauson-Khand reaction. Metal-carbene cycloadditions. Metal-catalyzed cycloaddition of small ring compounds. Author index. Subject index.