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2006 Benzopyran derivatives R 0350Ring-Closing Metathesis for the Synthesis of 2H-and 4H-Chromenes. -A series of 4H-chromenes (IV) and 2H-chromenes (XI) is prepared utilizing metathesis reaction of aryl vinyl ethers (III) or aryl allyl ethers (IX)/(X), resp., as key step. -(VAN OTTERLO, W. A. L.; NGIDI, E. L.; KUZVIDZA, S.; MORGANS, G. L.; MOLEELE, S. S.; DE KONING, C. B.; Tetrahedron 61 (2005) 42, 9996-10006; Mol. Sci. Inst., Sch. Chem., Univ. Witwatersrand, Johannesburg 2050, S. Afr.; Eng.) -Mischke 05-129

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