Anthracyclines. XII. The preparation of (-)-(7R)-7-acetyl-7(t-butyldimethylsilyloxy)-4,4-dimethoxy-5,6,7,8-tetrahydr onaphthalene-1(4H)-one and (+)-(6R)-6-acetyl-6-(t-butyldimethylsilyloxy)-4,4-dimethoxy-5,6,7,8-tetrahyd ronaphthalene-1(4H)-one: an improv

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