A mechanistic study of thermal and photochemical isomerization between hexasilyltetrasilabicyclo[1.1.0]butane and hexasilyltetrasilacyclobutene

Chemistry Letters

Volumn , Issue 3, 1998, Pages 277-278

  Iwamoto, Takeaki ^a   Kira, Mitsuo ^a  

^a TOHOKU UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0032336848     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.1998.277     Document Type: Article

References (23)

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11. 4e
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13. 1 rate-determining 1,2-silyl migration in the two-step reaction via intermediary formation of the corresponding tetrasilacyclobutane-1,3-diyl diradical would also be compatible with the observed ΔS‡.
14. 8 a stable hexaaryltetrasila-1,3-butadiene was synthesized very recently: M. Weidenbruch, S. Willms, W. Saak, and G. Henkel, Angew. Chem., Int. Ed. Engl., 36, 2503 (1997).
15. An ab initio MO study has shown that tetrasila-1,3-butadiene is far more unstable than the most stable isomer, tetrasilabicyclo[1.1.0]-butane; the energy difference is 17.9 kcal/mol at the MP2/6-31G* level: M. Zhao and B. M. Gimarc, Inorg. Chem., 35, 5378 (1996), and references cited therein.
16. 1,2 The spectral data of 6 are given in ref. 1.
17. 1H NMR spectroscopy to be more than 99%.
18. 1H NMR spectroscopy have failed.
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