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200517.fm Page 198 Friday, March 18, 2005 2:52 PM
2005
Organo-silicon compounds
S 0060
Synthesis of 1,1,4,4-Tetrabromo-2-butenes and Related Compounds via Desilylaof Silylated 1,3-Butadiene Derivatives. — Silylated 1,3-buta17- 179 tion—Bromination
dienes effectively undergo desilylation in the presence of TFA. Their desilylation—bromination results in selective formation of (E,E)-1,4-dibromo-1,3-dienes
which can further undergo bromination to afford 1,1,4,4-tetrabromo-2-butenes. Treatment of silylated 1,4-dihalo-1,3-dienes of type (XI) with NaOMe leads to hitherto
unknown (Z,Z)-1,4-dihalo-1,3-dienes. — (XI*, Z.; LIU, X.; LU, J.; BAO, F.; FAN, H.;
LI, Z.; TAKAHASHI, T.; J. Org. Chem. 69 (2004) 24, 8547-8549; Coll. Chem.,
Peking Univ., Beijing 100871, Peop. Rep. China; Eng.) — Jannicke
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