2,2-dimethylpropionic acid 9-(1-phenyl-1H-tetrazol-5-sulfonyl)nonyl ester   、                                                                                      
(8S,9S)-8-(tert-butyldimethylsilanyloxy)-9-methylheptacosanal                                                                                                                                                              在
                                                                                                                                                                                 
lithium hexamethyldisilazane                                                                                                                                  作用下,
                                                                                                                                                                                                                            以76%的产率得到2,2-dimethylpropionic acid (E/Z)-(17S,18S)-17-(tert-butyldimethylsilanyloxy)-18-methylhexatriacont-9-enyl ester