From the reaction of 1,8-bis(bromomethyl)naphthalene with diphenyl(trimethylsilyl)phosphine a cyclic phosphonium salt IX is formed which can be rearranged with (CH3)3PCH2 to yield the cyclic ylide X. Its metallation with t-butyllithium gives 2,2-diphenyl-2λ5-phospha-phenalenyl-lithium XI. The anion of XI cannot be seen as a delocalized phospha-phenalenyl π-system but rather as a phosphonium-bis-ylide
从1,8-双(溴甲基)萘的二苯基(三甲基甲硅烷)反应膦形成IX的环状鏻盐可与被重新排列(CH 3)3 PCH 2,得到环状叶立德X.其金属与叔丁基锂给出2,2-二苯基- 2λ 5 XI -phospha非那烯基锂。XI的阴离子不能看作是离域的膦-菲烯基π系统,而是类似于二苯基phosph-双亚苄基的a-双内酯。