2005 Benzopyran derivatives R 0350 Construction of Building-Blocks for Polyether Synthesis Using Sequential CataRing-Closing Enyne and Cross Metathesis. — Highly functionalized six- and 15- 126 lytic seven-membered cyclic ethers bearing a variety of side chains are synthesized using ring-closing enyne metathesis and subsequent cross metathesis of the intermediate diene. One-pot enyne and cross metathesis is accomplished, allowing ring construction and side chain introduction to be performed in a single operation. — (CLARK*, J. S.; ELUSTONDO, F.; KIMBER, M. C.; Chem. Commun. (Cambridge) 2004, 21, 2470-2471; Sch. Chem., Univ. Nottingham, Nottingham NG7 2RD, UK; Eng.) — M. Paetzel
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