View PDF Version
 
DOI: 10.1039/A803414A (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 3301-3304

Reaction of Al(tBu)3 with [R2Al{µ-O(CH2)nNMe2}]2: dependence on the extent of intra-molecular Al[hair space][hair space]· · ·[hair space][hair space]N coordination

(Note: The full text of this document is currently only available in the PDF Version )

C. Niamh McMahon, Simon G. Bott and Andrew R. Barron

Abstract

Reaction of Al(tBu)3 with (tBu)3Al[O(H)CH2CH2CH2NMe2] yielded the Lewis acid–base complex [(tBu)2Al{µ-OCH2CH2CH2N(Me)2Al(tBu)3}]2 1. Compound 1 is also formed directly when 2 equivalents of Al(tBu)3 reacts with 1 equivalent of [(tBu)2Al(µ-OCH2CH2CH2NMe2)]2. In contrast, the reaction of 2 equivalents of Al(tBu)3 with 1 equivalent of [Me2Al(µ-OCH2CH2NMe2)]2 yielded Me2Al(µ-OCH2CH2NMe2)Al(tBu)3 2. The molecular structure of compound 2 shows the AlMe2 moiety chelate bound to the anionic bidentate ligand, while the Al(tBu)3 unit is bonded to the anionic terminus of the ligand. The formation of compound 1 is proposed to occur via the tert-butyl analog of compound 2, i.e., (tBu)2Al(µ-OCH2CH2CH2NMe2)Al(tBu)3, which is unstable due to significant tBu[hair space][hair space]· · ·[hair space][hair space]tBu inter-ligand interactions. The implications of the differences in products is discussed with respect to the extent of intra-molecular Al[hair space][hair space]· · ·[hair space][hair space]N coordination in compounds of the general formula [R2Al{µ-O(CH2)nNMe2}]2.

References

  1. C. N. McMahon, S. G. Bott and A. R. Barron, J. Chem. Soc., Dalton Trans., 1997, 3129 RSC.
  2. A. R. Barron, Polyhedron, 1995, 14, 3197 CrossRef CAS.
  3. A. R. Barron, J. Chem. Soc., Dalton Trans., 1988, 3047 RSC.
  4. C. J. Harlan, S. G. Bott and A. R. Barron, J. Am. Chem. Soc., 1995, 117, 6465 CrossRef CAS.
  5. J. A. Francis, C. N. McMahon, S. G. Bott and A. R. Barron, Organometallics, submitted Search PubMed.
  6. D. A. Atwood, F. P. Gabbai, J. Lu, M. P. Remington, D. Rutherford and M. P. Sibi, Organometallics, 1996, 15, 2308 CrossRef CAS.
  7. M. R. P. van Vliet, G. van Koten, M. A. Rotteveel, M. Schrap, K. Vrieze, B. Kojic-Prodic, A. L. Spek and A. J. M. Duisenberg, Organometallics, 1986, 5, 1389 CrossRef CAS.
  8. S. Amirkhalili, P. B. Hitchcock, J. D. Smith and J. G. Stamper, J. Chem. Soc., Dalton Trans., 1980, 2493 RSC.
  9. Y. Kai, N. Yasuoka, N. Kassai and M. Kakudo, Bull. Chem. Soc. Jpn., 1972, 45, 3403 CAS.
  10. C. L. Aitken and A. R. Barron, J. Chem. Crystallogr., 1996, 26, 297 CAS.
  11. A. W. Apblett, A. C. Warren and A. R. Barron, Can. J. Chem., 1992, 70, 771 CAS.
  12. W. Uhl, Z. Anorg. Allg. Chem., 1989, 570, 37 CrossRef CAS; H. Lehmkuhl, O. Olbrysch and H. Nehl, Liebigs Ann. Chem., 1973, 708 Search PubMed; H. Lehmkuhl and O. Olbrysch, Liebigs Ann. Chem., 1973, 715 Search PubMed.
  13. O. T. Beachley, jun. and K. C. Racette, Inorg. Chem., 1976, 15, 2110 CrossRef.
  14. C. J. Harlan, S. G. Bott and A. R. Barron, J. Am. Chem. Soc., 1995, 117, 6465 CrossRef CAS.
  15. G. M. Sheldrick, Acta Crystallogr., Sect. A, 1990, 46, 467 CrossRef.
  16. MOLEN, An interactive Structure Solution Procedure, Enraf-Nonius, Delft, Netherlands, 1990.
  17. International Tables for X-Ray Crystallography, Kynoch Press, Birmingham, 1974, vol. 4 Search PubMed.
Click here to see how this site uses Cookies. View our privacy policy here.