            －OH                                                        －OH                                                          
                －OH    
    CHOH    CHCHOH   CHCHCHOH   OH   OH
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                                                                                                      CH—CH
        O－OH                                       J   lister 1827—1912                                                                －OH    
                                                 
                                         
CHCH－OH＋OCHCH———→ CHCH－O－CHOH＋HO
                               H＋                         
   
                                                  