2-Hydroxymethyl-3-(5-carboethoxypentyloxy)-4-pyrone                                                                                                                                                              在
                                                                                                                                         manganese dioxide                                                                                                                                                                                                                               
hexane-diethyl ether   、                                                                                                  
2-formyl-3-(5-carboethoxypentyloxy)-4-pyrone                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以to give the crystalline aldehyde, 2-formyl-3-(5-carboethoxypentyloxy)-4- pyrone的产率得到2-formyl-3-(5-carboethoxypentyloxy)-4-pyrone