B. Ohtani et al., STEREOSELECTIVE SYNTHESIS OF PIPERIDINE-2,6-DICARBOXYLIC ACIDS BY PHOTOCATALYTIC REACTION OF AQUEOUS CADMIUM(II) SULFIDE DISPERSION, Tetrahedron letters, 36(18), 1995, pp. 3189-3192
Photoirradiation at wavelength >300 nm onto a deaerated aqueous suspen
sion of cadmium(II) sulfide (CdS) particles in an aqueous solution of
a mixture of stereo isomers of 2,6-diaminopimelic acid (DAP) produced
piperidine-2,6-dicarboxylic acid (PDC). Both yield and trans/cis ratio
of PDC markedly depended on the kind of CdS photocatalysts, its pre-t
reatment, and loading of fine platinum particles. A CdS photocatalyst
prepared by heat-treatment at 1023 K in the presence of a small amount
of air showed the highest yield and trans/cis ratio.