The tmbp Dianion in the Contact Ion Pair [(tmbp)Na(2)(dme)(1.5)](n) and in the Solvent-Separated Ion Pair [tmbp][(2.2.1)Li](2) This work was supported by the CNRS and the Ecole Polytechnique; tmbp=4,4',5,5'-tetramethyl-2,2'-biphosphinine, DME=1,2-dimethoxyethane
Angew Chem Int Ed Engl. 2001 Dec 3;40(23):4476-4479.
doi: 10.1002/1521-3773(20011203)40:23<4476::aid-anie4476>3.0.co;2-j.