Patent 7319172 was granted and assigned to DSM (company) on January, 2008 by the United States Patent and Trademark Office.
Methylheptenone (2-methyl-2-hepten-6-one) is prepared by reacting 2-methyl-3-buten-2-ol with isopropenyl methyl ether in the presence of hydrogen tris(oxalato)phosphate or hydrogen bis(oxalato)borate.