Inorganic Chemistry, Vol.39, No.6, 1238-1254, 2000
Alkali salts of C-3-symmetric, linked aryloxides: Selective binding of substrates with metal aggregates
The lithium, sodium, and potassium salts of tris(3,5-dialkyl-2-hydroxyphenyl)methanes (tert-butyl, tert-pentyl, methyl) have been prepared by reaction of the triarylmethane with n-butyllithium, sodium hydride, and potassium hydride, respectively. These compounds are all hexanuclear aggregates composed of two triarylmethane units. Whereas the lithium salt is compact and cannot bind oxygen-donor solvent molecules, the sodium and potassium systems have vacant coordination sites that can interact with solvents. For the sodium compounds, the solvent can be subsequently removed, and the resulting coordinatively unsaturated compounds have been shown to selectively bind oxygen-donor substrates (ethers, aldehydes, and ketones) of suitable size and shape. The paper reports the synthesis and characterization of these novel compounds, including thirteen crystal structures of the salts and their adducts.
Keywords:DIELS-ALDER REACTION;ALUMINUM TRIS(2;6-DIPHENYLPHENOXIDE)ATPH;ASYMMETRIC CLAISEN REARRANGEMENT;CHIRAL ORGANOALUMINUMREAGENTS;HINDERED ALDEHYDE CARBONYLS;DIFFERENT ESTERCARBONYLS;LEWIS-ACID;METHYLALUMINUM BIS(2;6-DI-TERT-BUTYL-4-METHYLPHENOXIDE);CRYSTAL-STRUCTURES;MOLECULAR RECOGNITION