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What do titano- and zirconocenes do with diynes and polyynes?
U Rosenthal1, P M Pellny, F G Kirchbauer
1Institut für Organische Katalyseforschung, an der Universität Rostock, Buchbinderstrasse 5-6, D-18055 Rostock, Germany. uwe.rosenthal@ifok.uni-rostock.de
Abstract:
A thorough investigation of the reactions of diynes, R(C&tbd1;C)(2)R, and polyynes, R(C&tbd1;C)(n)()R, with titanocene and zirconocene was performed using the metallocene sources Cp(2)M(L)(eta(2)-Me(3)SiC&tbd1;CSiMe(3)) (M = Ti, L = -; M = Zr, L = THF, pyridine). The conversions show an array of different products generated in complexation, coupling, and cleavage reactions. These results include remarkable structures (e.g., five-membered metallacyclocumulenes) and reactions (e.g., C-C single-bond cleavage). In addition, the first C-C single-bond metathesis in homogeneous solution was discovered. The presented findings have been supported by theoretical studies.