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Lewis bases organolithium 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]

These mechanisms ascribe in jortance to the Lewis acid-Lewis base interaction between the allyl halide and the organolithium reagent. When substitution is complete, the halide ion is incorporated into the lifliium cluster in place of one of the carbon ligands. [Pg.435]

Notes A powerful Lewis base able to form strong cation complexes. This attribute is often associated with greatly increased reactivities when used in solvent. This is particularly true when used with organolithium reagents. Soluble in most solvents. [Pg.785]

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]

Also, addition of small quantities of Lewis bases such as amines to alkyllithium reagents in hydrocarbons markedly affects reactivity, especially in connection with various anionic polymerization reactions. Findings such as these prompted a number of research groups in the early 1950 s to study in detail the role of Lewis bases in the structures of organolithium compounds (4, 5). In each case it was concluded that coordination complexes form when amines are added to organolithium reagents in hydrocarbons. [Pg.257]


See other pages where Lewis bases organolithium reagents is mentioned: [Pg.70]    [Pg.140]    [Pg.263]    [Pg.14]    [Pg.1205]    [Pg.61]    [Pg.288]    [Pg.55]    [Pg.131]    [Pg.133]    [Pg.140]    [Pg.12]    [Pg.134]    [Pg.245]    [Pg.382]    [Pg.61]    [Pg.4660]    [Pg.5201]    [Pg.21]    [Pg.203]    [Pg.36]    [Pg.122]    [Pg.4659]    [Pg.5200]    [Pg.560]    [Pg.562]    [Pg.609]    [Pg.610]    [Pg.12]    [Pg.2]    [Pg.62]    [Pg.132]    [Pg.31]    [Pg.1362]    [Pg.153]    [Pg.229]    [Pg.114]   
See also in sourсe #XX -- [ Pg.229 , Pg.429 ]




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