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Diacel Chemical Industries, Ltd

Enantioselective deprotonation can also be successfully extended to 4,4-disubstituted cyclohexanones. 4-Methyl-4-phenylcyclohexanone (3) gives, upon reaction with various chiral lithium amides in THF under internal quenching with chlorotrimethylsilane, the silyl enol ether 4 having a quaternary stereogenic carbon atom. Not surprisingly, enantioselectivities are lower than in the case of 4-tm-butylcyclohexanone. Oxidation of 4 with palladium acetate furnishes the a./i-unsaturated ketone 5 whose ee value can be determined by HPLC using the chiral column Chiralcel OJ (Diacel Chemical Industries, Ltd.)59c... [Pg.600]

Fig. 4. Resolution of D and L forms of C-tryptophan using a Chiralpak-WH (Diacel Chemical Industries, Ltd.) HPLC column. The extreme difference in Rt of the two forms allows full resolution even with the large (100 1) difference in amounts found in plant material... Fig. 4. Resolution of D and L forms of C-tryptophan using a Chiralpak-WH (Diacel Chemical Industries, Ltd.) HPLC column. The extreme difference in Rt of the two forms allows full resolution even with the large (100 1) difference in amounts found in plant material...
Daicel Chemical Industries Ltd (M) Japan Diacel Chemical Industries Ltd. [Pg.51]

See other pages where Diacel Chemical Industries, Ltd is mentioned: [Pg.100]    [Pg.280]    [Pg.281]    [Pg.100]    [Pg.290]    [Pg.1149]    [Pg.1150]    [Pg.100]    [Pg.280]    [Pg.281]    [Pg.100]    [Pg.290]    [Pg.1149]    [Pg.1150]   


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