175788-33-7Relevant articles and documents
Direct Preparation of Allylic Zirconium Reagents from Zirconocene-Olefin Complexes and Alkenes
Fujita, Kazuya,Yorimitsu, Hideki,Shinokubo, Hiroshi,Oshima, Koichiro
, p. 3302 - 3307 (2007/10/03)
A novel method for preparation of allylic zirconium reagents directly from 1-alkenes via zirconoceneolefin complex has been developed. Selective transfer of the hydride of zirconocene allyl hydride complex, a tautomer of zirconocene-olefin complex, to diisopropyl ketone generates the corresponding zirconocene alkoxide allyl. The allylic zirconium reagents formed effects stereoselective allylation of aldehyde at 25 °C and -78 °C to provide syn- and anti-homoallyl alcohols, respectively. The anti-isomer is formed via a six-membered chair transition state under kinetic control. The syn-selectivity can be rationalized by considering isomerization of the anti-adduct by a retroallylation process.
Transformation of zirconocene-olefin complexes into zirconocene allyl hydride and their use as dual nucleophilic reagents: Reactions with acid chloride and 1,4-diketone
Fujita, Kazuya,Yorimitsu, Hideki,Shinokubo, Hiroshi,Oshima, Koichiro
, p. 6776 - 6783 (2007/10/03)
Zirconocene-olefin complexes Cp2Zr(H2C=CHR), prepared in benzene-THF at 0 °C, react with acid chlorides to provide homoallylic alcohols. The key is an equilibrium between the zirconocene-olefin complexes and the corresponding zircono
Barbier-type carbonyl-allylation with allyl compounds and SnCl2 in the presence of PdCl2[PPh2(m-C6H4SO 3Na)]2 under two-phase conditions
Okano, Tamon,Kiji, Jitsuo,Doi, Takanori
, p. 5 - 6 (2007/10/03)
The hydrophilic palladium complex efficiently catalyzes the allylation of carbonyl compounds with allyl chlorides or allyl alcohols and SnCl2 under aqueous-organic biphase conditions, which allow us easily to separate the product and to recover the organic solvent from the reaction mixture.