Microwave-accelerated methylation of starch.
A novel microwave-accelerated method for methylating soluble starch is described. Soluble starch could be fully methylated in 72% yield within 4.66 min using iodomethane and 30% potassium hydroxide under microwave irradiation. The completely methylated starch thus obtained was hydrolyzed with 60% HCO(2)H for 1.5 min under 80% MW power, followed by 0.05 M H(2)SO(4) for 2.0 min under 100% MW power. The partially methylated monosaccharides were separated by preparative paper chromatography and identified by their melting points and optical rotations.
Singh
Vandana
V
Department of Chemistry, University of Allahabad, Allahabad 211 002, India. singhvandanasingh@rediffmail.com
Tiwari
Ashutosh
A
D006847:Hydrocarbons, Iodinated; D008745:Methylation; D008872:Microwaves; D009005:Monosaccharides / Q000032:analysis; D013213:Starch / Q000737:chemistry*
D006847:Hydrocarbons, Iodinated; D009005:Monosaccharides; D013213:Starch; C014055:methyl iodide