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2004
Radical reactions
O 0195
Development of Radical Reactions with Zirconocene Complexes as Electron
Reagents. — Treatment of halides (I) with Schwartz reagent, in some cases
52- 039 Transfer
prepared in situ from Cp2ZrCl2 and Red-Al, affords the corresponding reduction products (II). Radical cyclization of 2-haloalkyl allyl ethers gives five-membered products
under the same reaction conditions. Moreover, it is shown, that the reduction also proceeds in the presence of a catalytic amount of Cp2ZrCl2. A zirconocene-olefin complex,
prepared in situ from Cp2ZrCl2 and BuLi, also induces reductive radical cyclizations of
(IX) and (XI). — (FUJITA, K.; YORIMITSU, H.; OSHIMA*, K.; Bull. Chem. Soc.
Jpn. 77 (2004) 9, 1727-1736; Dep. Mater. Chem., Grad. Sch. Eng., Kyoto Univ.,
Nishikyo, Kyoto 615, Japan; Eng.) — M. Paetzel
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