Alkali-Metal-Mediated Coupling of a Phosphorus-Substituted Alkene. Structural Characterization of Dilithium 1,1,4,4-Tetrakis(diphenylphosphino)butane-1,4-diide William Clegg Keith Izod William McFarlane Paul O‘Shau 10.1021/om980741x.s001 https://acs.figshare.com/articles/journal_contribution/Alkali-Metal-Mediated_Coupling_of_a_Phosphorus-Substituted_Alkene_Structural_Characterization_of_Dilithium_1_1_4_4-Tetrakis_diphenylphosphino_butane-1_4-diide/3783447 The butane-1,4-diide salt {(THF)<sub>2</sub>Li(Ph<sub>2</sub>P)<sub>2</sub>CCH<sub>2</sub>}<sub>2</sub> is obtained by treatment of (Ph<sub>2</sub>P)<sub>2</sub>CCH<sub>2</sub> with lithium in THF; hydrolysis of this salt yields the novel tetraphosphine {(Ph<sub>2</sub>P)<sub>2</sub>CHCH<sub>2</sub>}<sub>2</sub>. 1998-11-06 00:00:00 Ph 2 P tetraphosphine Li Tetraki Alkene Structural Characterization Dilithium lithium 2 CCH 2 THF salt yields 2 CHCH 2 hydrolysis