2-allyl-2-(2-methylallyloxy)pent-4-enal                                                                                                                                                              在
                                                                                                                                         chiral tridentate Schiff base ligand-chromium(III) complex                                                                                                                                                                                                                               4 A molecular sieve                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(3R)-2,2-diallyl-3-hydroxy-5-methylene-tetrahydro-2H-pyran   、                                                                                             (3S)-2,2-diallyl-3-hydroxy-5-methylene-tetrahydro-2H-pyran