The michael reaction adducts were obtained by the reaction of α, β-unsaturated carboxylic acid esters with thiocarboxylic acids in the presence of commercial MgO. Next, the same reaction was carried out using glycolic acid-modified MgO, which had been heated under vacuum prior to the modification. Both chemical yield and enantioselectivity were found to have maximum values against the amount of added glycolic acid.
Cyclodextrin-modified silica gel was synthesized by condensation between silica gel and α-cyclodextrin dodeca benzoate. It was found that the modified silica gel was useful carrier for chromatographic separation for both substituted aromatic compounds and racemic N-benzyloxycarbonyl amino acid nitrophenyl esters.
We have developed a new method of urushi purification by three-roll mill made of stone or ceramic which could be substituted for Nayashi and Kurome. Sukeurushi (clear urushi) obtained by this method has short drying time, low viscosity, good transparency without turbidity, high hardness and high gloss. These characteristics are resulted from a good dispersion of water with water-soluble polysaccharide and laccase and little effect in the molecular weight of urushiol and in the activity of laccase.