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Chelate formation organolithium compounds

Some heteroatom-substituted or chelate-stabilized organolithium compounds, on the other hand, can be sufficiently stable toward racemization to enable their use in stereoselective reactions with electrophiles [223, 225, 271, 531, 543, 552-554] (Scheme 5.75). This increased configurational stability of a-heteroatom-substituted carbanions might be due to the stronger pyramidalization of such carbanions [261,555] and fixation of the metal by chelate formation. [Pg.199]

ORGANOLITHIUM COMPOUNDS AS ELECTRON-TRANSFER AGENTS IN CARRON-CARRON ROND FORMATION. An instructive example of how RLi, rather than lithium metal, can act as an electron source (cf. Figure 2) is the cyclization of 2-(2-biphenylyl)-l,l-diphenylethene (34) by n-butyllithium. To enhance electron transfer, the chelating strong-donor TMEDA was employed. The observed cyclization to 9-(diphenylmethyl)fluorene (35) can best be explained by electron transfer (Scheme XIII).2... [Pg.111]

See other pages where Chelate formation organolithium compounds is mentioned: [Pg.60]    [Pg.78]    [Pg.107]    [Pg.26]    [Pg.166]    [Pg.381]    [Pg.67]    [Pg.478]    [Pg.12]    [Pg.1]    [Pg.767]    [Pg.348]    [Pg.54]    [Pg.11]   
See also in sourсe #XX -- [ Pg.162 , Pg.163 , Pg.164 , Pg.165 , Pg.166 , Pg.167 , Pg.168 , Pg.169 , Pg.177 , Pg.178 , Pg.179 , Pg.180 , Pg.186 , Pg.194 ]



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Chelate formation

Chelates organolithium

Chelating compounds

Chelation compounds

Formation organolithium

Organolithium compounds

Organolithium compounds formation

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