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The reduction of 1,4-diphenyl-1,4-bis(diphenylphosphanyl)buta-1,3-diene (1) (1,4-diphenyl- NUPHOS) with potassium in THF yields bis(THF)potassium 2,5-diphenylphospholide (2) which crystallizes with a chain structure. The metathesis reaction of 2 with the iodides of calcium, strontium, and barium leads to the formation of [bis(THF)calcium bis(2,5-diphenylphospholide)] (3), [bis(THF)strontium bis(2,5-diphenylphospholide)] (4), and [bis(THF)barium bis(2,5-diphenylphospholide)] (5). The reaction of M{P(H)SiiPr 3 } 2  with diphenylbutadiyne in THF also leads to the formation of the 2,5-diphenylphospholides of calcium (3), strontium (4), and barium (5). The molecular structures of 2 to 4 are discussed. The environment of the metal atoms is very similar in all these compounds: The metal atoms show an η 5  coordination to the phospholide rings forming a bent sandwich complex. The open coordination site is occupied by two THF molecules

zeitschrift für naturforschung b

Novel Synthetic Routes to s-Block Metal 2,5-Diphenylphospholides and Crystal Structures of the Bis(tetrahydrofuran) Complexes of the Potassium, Calcium, and Strontium Derivatives