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Cyclophanes O 0450 Synthesis, Properties and Formation of (RCp)Co-and (RCp)Rh-Stabilized[4.8] 3 cyclacene Derivatives. -(KORNMAYER, S. C.; HELLBACH, B.; ROMINGER, F.; GLEITER*, R.; Chem. Eur. J. 15 (2009) 14, 3380-3389; Org.-Chem. Inst., Ruprecht-Karls-Univ., D-69120 Heidelberg, Germany; Eng.) -Lindner 21-047

Rings with 7 or more membersRings with 7 or more members Q 0050Cyclic Diynes by Alkyne Metathesis. -The preparation of α,ω-diynes (V) with methyl groups at the termini is described and their ring-closing alkyne metathesis is studied. Thus, the dialkynes (Va-d) yield the dimeric cyclic dienes (VI) whereas octadeca-2,16-diyne (Ve) gives the monocyclic alkyne (VII) under similar conditions. -(HELLBACH, B.; GLEITER*, R.; ROMINGER, F.; Synthesis 2003 Synthesis , 16, 2535 Synthesis -2541 Org.-Chem. Inst., Ruprecht-Karls-Univ., D-69120 Heidelberg, Germany; Eng.) -Mais 11-078