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Group orbitals tricoordinated atoms

Figure 3.18. Group orbitals for a tricoordinated atom with planar (left) and pyramidal (right)... Figure 3.18. Group orbitals for a tricoordinated atom with planar (left) and pyramidal (right)...
In certain cases, the reduction can take place without electrophilic catalysis (n-BU4NBH4 or phase-transfer conditions), but most frequently it requires the coordination of the carbonyl group by a Lewis acid before nucleophilic attack [S2]. The Lewis acid may be the cation associated with the reagent, an added acid, or even the boron or aluminum atom of tricoordinate reagents (AIH3, DIBAH, boranes). The importance of this phenomenon has been shown by the introduction of coordinating macrocyclic molecules into solutions of LAH and LiBH4. This considerably retards the reduction of carbonyl compounds in an ether medium [DCl, HPl], Electrophilic catalysis is more important when the lowest unoccupied molecular orbital (LUMO)... [Pg.38]

See other pages where Group orbitals tricoordinated atoms is mentioned: [Pg.257]    [Pg.259]    [Pg.257]    [Pg.259]    [Pg.257]    [Pg.259]    [Pg.257]    [Pg.259]    [Pg.278]    [Pg.9]    [Pg.172]    [Pg.252]    [Pg.304]    [Pg.172]    [Pg.252]    [Pg.304]    [Pg.1033]    [Pg.121]    [Pg.172]    [Pg.252]    [Pg.304]    [Pg.236]    [Pg.172]    [Pg.252]    [Pg.304]    [Pg.319]    [Pg.156]    [Pg.156]   
See also in sourсe #XX -- [ Pg.59 ]

See also in sourсe #XX -- [ Pg.59 ]



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Group orbitals

Group orbitals atoms

Tricoordinated

Tricoordinated Atoms

Tricoordination

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