I Introduction.- II New Synthetic Developments.- A Annulation Reactions.- B Ring Expansion, Contraction, and Cleavage Processes.- C Pauson-Khand Reaction.- D Photochemical Approaches.- E Rearrangement Routes to Polyquinanes.- F Trapping of 1,3-Diyls.- G Transannular Cyclizations.- III Functional Group Manipulation Within Polyquinanes.- A Reactions Involving Ketonic Substrates.- B Carbocationic Processes.- C Reactions Involving Olefinic Centers.- D Miscellaneous.- IV Physical Data for, and Theoretical Analysis of, Polyquinanes.- A Crystal Structure Data.- B Photoelectron Spectra.- C Molecular Orbital Calculations.- D Miscellaneous.- V Molecules of Theoretical Interest.- A Pentalene.- B Semibullvalenes.- C Syn/anti-Sesquinorbornenes.- D Triquinacenes.- E Tricyclic [10]Annulenes.- F Fenestranes and Related Molecules.- G (D3)-Trishomocubanes and Congeners.- H Peristylanes.- I Chemistry Surrounding Dodecahedrane.- VI Natural Products Chemistry.- A Isolation and Physical Properties.- B Biosynthesis and Chemical Transformations.- VII Synthesis of Nonpolycyclopentanoid Natural Products by Way of Diquinane Intermediates.- A Allamcin.- B Boonein.- C BrefeldinA.- D Dendrobine.- E Forsythide Aglycone Dimethyl Ester.- F Ikarugamycin.- G Iridodial.- H Isoiridomyrmecin.- I Loganin and Analogues.- J Oplopanone.- K Plumericin.- L Trichodiene.- M Udoteatrial.- N Xylomollin.- VIII Synthesis of Diquinane Natural Products.- A Cedranoids.- B The Pentalenolactone Group.- C Quadrone and Terrecyclic Acid.- D Ptychanolide.- E Albene.- F Carbaprostacyclins.- G Ryanodine and the Ryanoid Insecticides.- IX Synthesis of Triquinane Natural Products.- A Linear Triquinanes.- B Angular Triquinanes.- C Propellane Structures.- X References.