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Organolithium additions to styrene derivatives: Intramolecular alkylation processes

✍ Scribed by Xudong Wei; Richard J.K. Taylor


Publisher
Elsevier Science
Year
1996
Tongue
French
Weight
105 KB
Volume
37
Category
Article
ISSN
0040-4039

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Organolithium additions to styrene deriv
✍ Xudong Wei; Richard J.K. Taylor πŸ“‚ Article πŸ“… 1997 πŸ› Elsevier Science 🌐 English βš– 257 KB

Organolithium addition to styrene and its derivatives, followed by electrophilic trapping, has been investigated in the presence of (-)-sparteine. With styrene, enantiomeric excesses up to 30% were observed, the ee depending on the solvent, temperature and electrophile. With 2-substituted styrenes,

A Ξ²-lactone-based route to cyclopentanes
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Lewis acid promoted intramolecular additions of allylsilanes to I~-lactones proceed smoothly to give variously substituted cyclopentanes. A proposed transition state assembly for this reaction guided our efforts to improve the stereo.selectivity, A novel Fdedel-Cr'dts alkylation of ~-lactones is als