Aromatic Spiranes, XXII [1]: Preparation of Cyclopenteno-4,5-indan-1-one and 2-Carbomethoxy- and 4-Chloromethyl-indane as Synthones for the Syntheses of Anellated 2,2′-Spirobiindanone

Article abstract of DOI:10.1007/BF00813793

The title compounds were prepared as follows: tert.-butyl-indane (10) was formylated to give a 72:28 mixture of the aldehydes 23a and 23b which were submitted to a Knoevenagel-Doebner condensation to afford the cinnamonic acids 24. From the mixture, the p