(E)-ethyl 2-acetyl-5-methyl-6-(3-methylbut-2-enyloxy)hex-4-enoate                                                                                                                                                              在
                                                                                                                                                                                 
水   、                                                                                                  
copper(II) acetate monohydrate   、                                                                                                  
manganese(III) triacetate dihydrate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                生成                                                 ethyl 5-hydroxy-1,1,5-trimethyl-1,4a,5,6,8,8a-hexahydropyrano[3,4-c]pyran-3-carboxylate   、                                                                                             ethyl 5-hydroxy-1,1,5-trimethyl-1,4a,5,6,8,8a-hexahydropyrano[3,4-c]pyran-3-carboxylate   、                                                                                             ethyl 5-hydroxy-1,1,5-trimethyl-1,4a,5,6,8,8a-hexahydropyrano[3,4-c]pyran-3-carboxylate