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ChemInform Abstract: Stereoselective Epoxidation of Electron Poor Dienes Using Poly(L-leucine).

✍ Scribed by J. V. ALLEN; M. W. CAPPI; P. D. KARY; S. M. ROBERTS; N. M. WILLIAMSON; L. E. WU

Publisher
John Wiley and Sons
Year
2010
Weight
36 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

Stereoselective Epoxidation of Electron Poor Dienes Using Poly(Lleucine).

-Poly(L-leucine) catalyzed oxidation of dienes and trienes such as (I) provides the corresponding epoxides in good to excellent yield and high optical purity. The epoxides obtained are susceptible to attack at multiple points. The ketone carbonyl group [β†’ (IV)], the alkene moiety [β†’ (VII)], and the oxirane ring [β†’ (VI)] can be attacked in a chemoselective fashion. - (ALLEN,

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## Abstract A non cross‐linked polystyrene bearing both phosphine and phenol groups is used as heterogenous catalyst for the stereoselective preparation of different (E,E)‐dienes and (E,E,E)‐trienes in excellent yields by isomerization of the corresponding alkynes.