Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Boronic ligand exchange with

Mn(CO)sCFj Ligand Exchange with Boron Trihalides... [Pg.221]

Termination also occurs if ligand exchange produces a weaker Lewis acid which is unable to reactivate the covalent adduct. In this case, addition of another aliquot of the stronger acid may reactivate the system. For example, hydroxy or alkoxy groups are exchanged in polymerization systems based on boron trifluoride and adventitious water or alcohol, respectively. Termination occurs infrequently by irreversible cleavage of B—F bond from the BF3OH anion, with irreversible C—F bond formation [Eq. (127)]. [Pg.248]

An unusual feature of the Beat ligand in metal-Bcat complexes is the resistance of the the B-O(catecholale) bonds to exchange with other alcohols. For example, whereas Ru(Bcat)Cl(CO)(PPh3)2 may be recovered unchanged from EtOH solutions, compound (15), where the Beat function is no longer directly attached to the metal, undergoes rapid ethanolysis.11 The observation of substitution reactions at the boron centre therefore... [Pg.383]

The metalloid elements include boron, silicon, germanium, arsenic, antimony, tellurium, and astatine. Ligand exchange reactions complete much faster for silicon complexes when compared with carbon complexes because the silicon atom can form a hypervalent transition state that carbon cannot. [Pg.157]

See other pages where Boronic ligand exchange with is mentioned: [Pg.111]    [Pg.14]    [Pg.157]    [Pg.13]    [Pg.288]    [Pg.221]    [Pg.229]    [Pg.73]    [Pg.35]    [Pg.143]    [Pg.31]    [Pg.134]    [Pg.206]    [Pg.62]    [Pg.67]    [Pg.98]    [Pg.46]    [Pg.187]    [Pg.628]    [Pg.114]    [Pg.633]    [Pg.311]    [Pg.13]    [Pg.304]    [Pg.4134]    [Pg.597]    [Pg.48]    [Pg.968]    [Pg.237]    [Pg.1167]    [Pg.164]    [Pg.191]    [Pg.4133]    [Pg.10]    [Pg.244]    [Pg.186]    [Pg.144]    [Pg.146]    [Pg.871]    [Pg.142]    [Pg.34]    [Pg.722]    [Pg.198]    [Pg.214]    [Pg.214]    [Pg.281]   
See also in sourсe #XX -- [ Pg.13 ]



SEARCH



Ligand exchange

Ligands ligand exchange

© 2024 chempedia.info