Efficient Synthesis of 2,8‐Diphosphatricyclo[5.3.1.1<sup>2,6</sup>]dodeca‐3,5,9‐triene 2,8‐Dioxides
                                
                                    
                                        作者:János Kovács、Tímea Imre、Krisztina Ludányi、László Toke、György Keglevich                                    
                                    
                                        DOI:10.1081/scc-120028634
                                    
                                    
                                        日期:2004.12.31
                                    
                                    The reaction of 1,2-dihydrophosphnine oxides (3a-3d) with tetracyanoethylene (TCNE) did not follow the Diels-Alder protocol, rather the corresponding diphosphatricyclododecatrienes (4a-4d) were formed in good yields. Interaction of the mesityl-dihydrophosphinine oxide (3f) with TCNE resulted in the formation of an alpha-dicyanomethylene derivative (5).