Other natural productsOther natural products U 0800Isolation and Synthesis of Chalcones with Different Degrees of Saturation. -Crotaoprostrin (I) is identified for the first time as a natural product. The structures of polyarvin (II), crotaramin (IIIa), crotaramosmin (IIIb) and crotin (IIIc) are confirmed by chemical synthesis. -(KROHN*, K.; STEINGROEVER, K.; RAO, M. S.; Phytochemistry 61 (2002) 8, 931-936; Fachbereich Org.

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Transition Metal-Catalyzed Oxidations. Part 11. para-Selective Chlorination and Bromination of Phenols with tert-Butyl Hydroperoxide and TiX(OiPr) 3 .-The title reaction proceeds with high paraselectivity and only small amounts of dibromination products are formed.

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