| abstract |
(57) [Problem] To provide a method for producing α-methylene-γ-butyrolactone by a simple process using inexpensive raw materials. SOLUTION: The β-position and / or γ-position has 1 to 1 carbon atoms. 8 and γ- butyrolactone which may be substituted with an alkyl group (R 1 ~R 4) is also represented by a good general formula (I), a raw material gas containing formaldehyde or formaldehyde derivatives, the general formula Si a Cs b W c X d O e (where X is silver, It is selected from niobium, magnesium, aluminum, nickel, zinc, molybdenum, chromium, antimony, titanium and platinum, and when a = 100, b = 0 to 10 and c = 1. And d = 0 to 10, and e is the number of oxygen atoms required to satisfy the valence of each component. A) Method for producing α-methylene-γ-butyrolactone represented by the general formula (II), wherein the reaction is carried out in the presence of a catalyst represented by the following formula: Embedded image Embedded image |