5-ethylidene-2-norbornene                                                                                                                                                              在
                                                                                                                                                                                 ethylaluminum chlorobromide   、                                                                                                  
硫化氢                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                生成                                                 
rac-((1R,2R,4S)-6-ethylidenebicyclo[2.2.1]heptan-2-yl)((1S,2R,4R)-6-ethylidenebicyclo[2.2.1]heptan-2-yl)sulfane   、                                                                                             endo,endo-di(6-ethylnor-3-tricyclyl) sulfide, meso form   、                                                                                             endo,endo-di(6-ethylnor-3-tricyclyl) sulfide, d,l form