[C:1]([O:4][CH:5]1[CH2:13][C:12]2[C:7](=[CH:8][CH:9]=[C:10]([N+:14]([O-])=O)[CH:11]=2)[CH2:6]1)(=[O:3])[CH3:2]>C(O)C.Cl.O>[NH2:14][C:10]1[CH:11]=[C:12]2[C:7](=[CH:8][CH:9]=1)[CH2:6][CH:5]([O:4][C:1](=[O:3])[CH3:2])[CH2:13]2A slurry of 8.0 g (0.045 moles) of 2-acetoxy-5-nitroindan in 25 ml of absolute ethanol and 32 ml of concentrated hydrochloric acid was treated over 1 hr with a solution of 24 g (0.11 moles) of stannous chloride in 32 ml of absolute ethanol, with water bath cooling to maintain T=20°C. The mixture was stirred for 1 day at room temperature, diluted with 100 ml of water and extracted twice with ether. The aqueous phase was basified with 10% sodium hydroxide until the hydroxides redissolved, then extracted with chloroform, dried (sodium sulfate) and evaporated to an oil which crystallized to 3.9 g (82%) 5-amino-2-hydroxyindan, the hydrochloride of which had mp 237°-239° after one crystallization from ether-methanol isopropanol.
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