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Prof. Dr. Hans Jürgen Bestmann, Dipl.-Chem. Harald Behl and Dipl.-Chem. Matthias Bremer Phosphonioboratoacetylenes: C2 Stabilized by Donor and Acceptor Molecules Angewandte Chemie International Edition in English 28

Version of Record online: 30 DEC 2003 | DOI: 10.1002/anie.198912191

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A complexed C2 molecule: that is one way of describing the C2 unit of the compound Ph3B⊖[BOND]C [TRIPLE BOND] C[BOND]⊕PMePh2 (1), which is derived from ethynyldiphenylphosphane, butyllithium, BPh3, and methyl iodide. The bulky substituents shield the C[TRIPLE BOND]C bond so effectively that 1 does not react with 1, 3-dipoles. At the same time, however, its P-CH3 group is transformed into P-C2H5 by deprotonation and methylation.

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