195319-09-6Relevant articles and documents
1,4-Distanna-[4]ferrocenophanes by Pt(0)-catalysed distannation of alkynes
Herberhold, Max,Steffl, Udo,Wrackmeyer, Bernd
, p. 76 - 81 (1999)
1,1,2,2-Tetramethyl-1,2-distanna-[2]ferrocenophane 1 reacts with alkynes R-C≡CH [R = H (a), Me (b), nPr (c), nBu (d), nPen (e), Ph (f), Me3SiOCH2 (g), Et(HO)CH (h), EtO(O)C (i)], in the presence of a catalytic amount of bis(triphenylphosphane)etheneplatinum 3, to give the 1,1,4,4-tetramethyl-1,4-distanna-[4]ferrocenophanes 4a-i by 1,2-distannation of the C≡C bond. The same products are obtained by the stoichiometric reaction of the alkynes with 1,1,3,3-tetramethyl-2,2-bis(triphenylphosphane)-1,2-distanna-3-platina-[3] ferrocenophane 2. This platinum(II) complex also reacts with cyclooctyne and dimethyl acetylene dicarboxylate to give the [4]ferrocenophanes 5 and 6, respectively. Thus, complex 2 must be considered as the active species in the Pt(0)-catalysed distannation of alkynes. The products were characterised by 1H-, 13C- and 119Sn-NMR, using one- and two-dimensional techniques.
The first 1,3-distanna-2-platina-[3]ferrocenophane and the Pt0-catalyzed addition of 1,1,2,2-tetramethyl-1,2-distanna[2]ferrocenophane to C≡C bonds
Herberhold,Steffi,Milius,Wrackmeyer
, p. 1508 - 1510 (2008/10/09)
An intermediate in the metal-catalyzed distannylation of alkynes, the complex 1, has been fully characterized for the first time by X-ray crystal structure analysis and multinuclear NMR spectroscopy. [4]Ferrocenophanes 2 are also directly obtained by addition of 1,2-bis(dimethylstanna)[2]ferrocenophane to alkynes in the presence of [Pt(PPh3)2(C2H4)]. R = H, Me, nBu, Ph.