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A Restitutive Bergman Rearrangement: Synthesis of a CpCo-Complexed, Tetraethynylated Cyclobutadiene

✍ Scribed by Dr. Markus Altmann; Dipl.-Chem. Gaby Roidl; Priv.-Doz. Dr. Volker Enkelmann; Dr. Uwe H. F. Bunz

Book ID
101560067
Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
413 KB
Volume
36
Category
Article
ISSN
0044-8249

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✦ Synopsis

A solution of bromine (8.0 g. 50 mmol) in pentane (50 mL) was added dropwise to a solution of [{Li,(NtBu),S),] (14.8 g, 25 mmol) in pentane (50 mL) at -78 'C. After the reaction mixture was stirred for 1 h a t room temperature, the solvent was removed in vacua, and the crude product condensed in a cold trap. Crystallization of the resulting yellow oil from tert-butylamine yielded a colorless solid that melts

πŸ“œ SIMILAR VOLUMES

A short synthesis of donor-acceptor subs
A short synthesis of donor-acceptor substituted CpCo-capped cyclobutadiene-superphanes
✍ Gebhard Haberhauer; Rolf Gleiter πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 French βš– 171 KB

The reaction of 1,1,3,3-tetramethyl-l,3-disilanona-4,8-diyne (7) and 1,1,4,4-tetramethyl-l,4-disiladeca-5,9-diyne (8) with R-CpCo(CO)2 (R=H, CH3) allowed to stop the reaction at the stage of tricyclic intermediates, the latter could be reacted again with R-CpCoLz(L2=COD,(CO)2) to yield CpCo-capped c