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Lewis bases Grignard reagents

Like other Lewis bases, Grignard reagents, organolithium reagents, and metal hydrides are also able to undergo addition to carbonyl-containing compounds. These additions lead directly to the next subject. [Pg.799]

Nucleophilic addition to C=0 (contd.) ammonia derivs., 219 base catalysis, 204, 207, 212, 216, 226 benzoin condensation, 231 bisulphite anion, 207, 213 Cannizzaro reaction, 216 carbanions, 221-234 Claisen ester condensation, 229 Claisen-Schmidt reaction, 226 conjugate, 200, 213 cyanide ion, 212 Dieckmann reaction, 230 electronic effects in, 205, 208, 226 electrons, 217 Grignard reagents, 221, 235 halide ion, 214 hydration, 207 hydride ion, 214 hydrogen bonding in, 204, 209 in carboxylic derivs., 236-244 intermediates in, 50, 219 intramolecular, 217, 232 irreversible, 215, 222 Knoevenagel reaction, 228 Lewis acids in, 204, 222 Meerwein-Ponndorf reaction, 215 MejSiCN, 213 nitroalkanes, 226 Perkin reaction, 227 pH and, 204, 208, 219 protection, 211... [Pg.211]

Problem 13.53 How does the Lewis theory of acids and bases explain the functions of (o) ZnCl, in the Lucas reagent (b) ether as a solvent in the Grignard reagent M... [Pg.288]

Allylic alkylations (Scheme 5) using Grignard reagents and the Lewis base imida-zolinium chloride (8) have been found to give 82% of the Sn2/ product with a 97% ee.13 ... [Pg.235]

A copper-free catalytic enantioselective addition to p-ch 1 oro-cr,/3-unsaturated esters has been developed in the presence of A-heterocyclic carbenes.92 The activation of Grignard reagents has been achieved using a Lewis base. ... [Pg.293]

In covalent organolithium compounds and covalent Grignard reagents neither the lithium nor the magnesium possesses a valence electron octet. This is energetically disadvantageous. In principle, the same mechanism can be used to stabilize these metals that monomeric boranes BH3 n Rb use to attain a valence electron octet at the boron atom (Section 3.3.3) the formation either of oligomers or, with suitable electron pair donors, of Lewis acid/Lewis base complexes. [Pg.398]

See other pages where Lewis bases Grignard reagents is mentioned: [Pg.294]    [Pg.293]    [Pg.189]    [Pg.178]    [Pg.110]    [Pg.621]    [Pg.289]    [Pg.96]    [Pg.434]    [Pg.384]    [Pg.61]    [Pg.207]    [Pg.288]    [Pg.412]    [Pg.672]    [Pg.791]    [Pg.31]    [Pg.752]    [Pg.773]    [Pg.308]    [Pg.148]    [Pg.874]    [Pg.72]    [Pg.357]    [Pg.199]    [Pg.257]    [Pg.33]    [Pg.259]    [Pg.134]    [Pg.249]    [Pg.430]    [Pg.751]    [Pg.328]    [Pg.668]    [Pg.52]    [Pg.304]    [Pg.61]   
See also in sourсe #XX -- [ Pg.228 , Pg.429 ]



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