Sambasivarao Kotha and Ethirajan Manivannan
J. Chem. Soc., Perkin Trans. 1, 2001, 2543-2547
DOI:
10.1039/B106280H,
Paper
Various 2,2′-spirobiindane-1,3-dione derivatives which are useful precursors for the synthesis of unsymmetrical benzoannelated fenestranes are reported via [2+2+2] and [4+2] cycloaddition reactions as key steps.