3-Ethynyl-7-methoxy-2-benzofuran-1(3H)-one 、 carbon monoxide;[(3,3-dimethyl-1,5-dioxaspiro[5.5]undec-9-en-9-yl)-methoxymethylidene]chromium 生成 3-(1'-hydroxy-4'-methoxy-5,5-dimethylspiro[1,3-dioxane-2,7'-6,8-dihydro-5H-naphthalene]-2'-yl)-7-methoxy-3H-2-benzofuran-1-one