- CATYLYTIC SYNTHESIS AND REACTIONS OF MAGNESIOCYCLOALKANES. 2. SYNTHESIS OF SUBSTITUTED MAGNESIOCYCLOPENTANES IN THE PRESENCE OF ZYRCONIUM COMPLEXES
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Catalytic cyclometallation of styrene, m-methylstyrene, p-tert-butylstyrene, and 1-hexene with di n-alkylmagnesium compounds (n-R2Mg, where R=C3H7, C4H9, C6H13) in the presence of Cp2Zr2Cl2 has been given high yields of 2,4-disubstituted magnesiocyclopentanes.The probable mode of formation of magnesiocyclopentanes, involving zirconocyclopentanes formed from Cp2ZrCl2, n-R2Mg, and the appropiate olefins as reactive intermediates in the cyclometallation, is discussed. Keywords: catalytic synthesis, substituted styrenes, alkenes, magnesium alkyls.
- Dzhemilev, U. M.,Sultanov, R. M.,Gaimaldinov, R. G.,Muslukhov, R. R.,Lomakina, S. I.,Tolstikov, G. A.
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p. 770 - 788
(2007/10/02)
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- Regioselective and Diastereoselective Alkyl-Alkene and Alkene-Alkene Coupling Promoted by Zirconocene and Hafnocene
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The reaction of Cp2Zr(CH2CH2R1)2 with a monosubstituted terminal alkene (H2C=CHR2) can produce, in a highly regio- and diastereoselective manner, zirconacyclopentane derivatives; the trans-3,4-disubstituted derivatives may be formed to the extents of >98percent in cases where both R1 and R2 are alkyl, while the trans-2-aryl-4-alkyl derivatives may be formed to the extents of >98percent in the coupling between a monoalkyl-substituted olefin and styrene or its derivative.
- Swanson, Douglas R.,Rousset, Christophe J.,Negishi, Ei-ichi,Takahashi, Tamotsu,Seki, Takashi,et al.
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p. 3521 - 3523
(2007/10/02)
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