Clusters from lithium or sodium, phosphorus, and silicon form the frameworks of the title compounds 1–4. Compound 2 consists of two clusters 1, which are “glued together” by a (LiCI)2 ring. Compounds 3 and 4 form under the same conditions; 4 relieves the ring strain by opening the polyhedron. Two Na centers in 4 are each η2-coordinated to one toluene (L) molecule. SiR2 = SitBuIs, Is = 2,4,6-iPr3C6H2; PR = PSiiPr3.
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Drieß et al. (1995) studied this question.
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