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P-Ylids

When we are talking about S ylids or P ylids, stabilized refers to stabilization of the carbanion as explained in Chapter 31. [Pg.1262]

Wittig reactions and its Horner variations have also been applied. The formation of a disubstituted, isolated double bond with high (E)- or fZj-selectivity by the Wittig reaction is possible with reactive ylids. In the case of conjugated polyenes, however, it is of limited value since fE/Zj-mixtures are usually obtained (see Chapter 2 Part HI). If (Zj-ot,P-unsaturated aldehydes or (Zj-a,p-ylids are used, their fZ>configuration is preserved, but the newly formed double bond is an (E/Zj-mixture [9] (Scheme 2). [Pg.219]

Yeast 43, 47 44, 17 Yeast, immobilized 29, 36s43 -, ultrasonically-stimulated 43, 660 P-Ylid carbanions... [Pg.261]

P-Ylids s. Alkylidene-phosphoranes, Phosphonium ylids, cyclic, Ring-0,P-ylids... [Pg.318]

N, N-heterocyclics, N-condensed 22, 708 P-Ylids s. a. Alkylidene-phosphoranes stable... [Pg.295]

See other pages where P-Ylids is mentioned: [Pg.135]    [Pg.135]    [Pg.707]    [Pg.135]    [Pg.1401]    [Pg.97]    [Pg.251]    [Pg.283]    [Pg.173]    [Pg.549]    [Pg.261]    [Pg.261]    [Pg.457]    [Pg.458]    [Pg.84]    [Pg.308]    [Pg.96]    [Pg.344]    [Pg.10]    [Pg.144]    [Pg.235]    [Pg.264]   


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Ylid

Ylids

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