Preparation and chiral recognition ability of cellulose 3,5‐dimethylphenylcarbamate immobilized on silica gel through radical polymerization

Polysaccharide‐immobilized chiral stationary phases (CSPs) were prepared by the polymerization of cellulose 3,5‐dimethylphenylcarbamate, having a polymerizable vinyl group, such as 4‐vinylphenylcarbamate or 2‐methacryloyloxyethylcarbamate, at the 6‐position, with a vinyl monomer, such as styrene, isoprene, t‐butyl acrylate, or t‐butyl methacrylate, on silica gel under various conditions. Their chiral recognition abilities were then evaluated with high‐performance liquid chromatography. The immobilized cellulose 3,5‐dimethylphenylcarbamate remained on the silica gel even if washed with tetrahydrofuran, which could dissolve the cellulose derivative. The chiral recognition abilities of the immobilized CSPs were similar to those of the coated CSPs when the vinyl monomer content was low. The chiral recognition abilities of the obtained immobilized CSPs slightly depended on the vinyl monomers. The immobilization of the cellulose derivatives was more efficiently attained on the silica gel modified with a vinyl compound. The cellulose derivatives, randomly having a vinyl group at the 2‐, 3‐, or 6‐position of the glucose unit, were prepared by a one‐pot reaction. The immobilization efficiency of these derivatives was slightly lower than that of the derivative with the vinyl group at the 6‐position.