View all references and amorphous SO 3 H??SiO 2 1920. Shimizu , K. , Hayashi , E. , Hatamachi , T. , Kodama , T. and Kitayama , Y. 2004. Tetrahedron Lett., 45: 5135 [CrossRef], [Web of Science ®] View all references with methanol have also been employed for the preparation of dimethylacetals. This diversity of methods is accounted for by the fact that not all of them can be applied to the different types of ketones but rather that they are complementary. Acetal ...