Synthesis of diphenylmethane from formalin and benzene in a biphasic system with 12-tungstophosphoric acid.
Heteropoly acids such as H3PW12O40 are exceptionally active catalysts in the synthesis of diphenylmethane from benzene and formalin (aqueous formaldehyde) in a biphasic system and can be recycled simply by drying the aqueous phase at room temperature.
Hou
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Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
Okuhara
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