Synthesis and structure of silylene complexes of silacyclobutanes

Norbert Auner, Martin Grasmann, Bernhard Herrschaft, Paul Kiprof

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Reactions of 1.1-dichloro-2-neopentyl-3-vinyl-l-silacyclobutane (1a, b) with carbonyl metallates [{M(CO)n}m]2- (M = Fe, m = 1, n = 4; M = Cr, m = 1, n = 5; M = W, m = 2, n = 5) in THF/HMPA lead to novel compounds [(CO)nMSiC10H18] · HMPA (M = Fe, n = 4; M = Cr, W, n = 5). 1H, 13C and 29Si NMR spectroscopic studies in solution support the formation of four diastereomeric pairs of enantiomers. The X-ray structure analyses of the crystals show folded 1-metallated 1-silacyclobutane units in which the HMPA ligand increases the coordination number of Si to 3 + 1. Crystals of [(CO)5CrSiC10H18] · HMPA (2) and of [(CO)5WSiC10H18] · HMPA (3) (corresponding values in brackets) are isotypic: P21/n (No. 14); a = 1084(1)/[1099(1)], b= 1927(1)/[1937(1)], c= 1342.1(8)/[1342(1)] pm, β = 97.11(7)/[97.18(7)]°, Z = 4. In both crystals enantiomeric [1S,2S,3S]/[1R,2R,3R] pairs are present. In orthorhombic crystals of [(CO)4FeSiC10H18]. · HMPA (4) (P212121 (No. 19), a = 896.4(5), b = 1693(1), c = 1753(1) pm, Z= 4) only the [1S,2S,3S]-isomer is detected.

Original languageEnglish (US)
Pages (from-to)387-398
Number of pages12
JournalJournal of Organometallic Chemistry
Issue number1-2
StatePublished - Oct 4 1995
Externally publishedYes

Bibliographical note

Funding Information:
We thank the Deutsche Forschungsgemeinschaft, the Stiftung Volkswagenwerk and Dow Coming Ltd., Barry, UK, for financial support; we are also grateful to Wacker Chemie GmbH, Burghausen and the Firma Chemetall, Frankfurt am Main for supplying chlorosilanes and lithium organyls.


  • Chromium
  • Iron
  • Silacyclobutanes
  • Silanes
  • Silylene complexes
  • Tungsten


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