| 摘要 |
<p>In order to provide a novel Lewis acid catalyst, which shows high reaction activity in aqueous medium, is easily recovered, and is excellent in reusability, a Lewis acid group expressed by the general formula (I): MXn (wherein M represents a polyvalent element, X represents an anionic group, and n is an integer representing the valence of M> is linked and supported on a polymer membrane via an SO3 or SO4 group.</p> |
