                  5 10  12                                                                                                  
     CH  CH  CH  — —→ CH  CH  CH＝CH＋ CH  CH  CH
                            500 ℃  
         18—                    1—                            
              △
       ———→         70   d           R 
                
  
        18—                                                   10  7       70                                
                                                                                   90                          
                                                                                   CH
                       AIOSiO                                                 |
CH  CH  CH——→  CH  CH  CH＋CHCHCHCCH                                  
                        500℃                                 |                |
                                                                 CH            CH
      18—           2— —2—          2  2  4—       
                                                                        
                                                        CH
                                                          |
CH  CH  CH —————→  CHCH  CH  CH＋   
                       p\   
                        \               2—     
                         \      
                                           
                                                                                               
                                                                
     CH                                                               CH                 CH
       |                                                                    |                     |
CHC—H＋CH＝CH  ————→ CH—C—CH—CH—CH
       |                                  HSO  HF               |
     CH                                                              CH                
                                                                                     
                                       
                                                   10  20                   1970         30                
                                  