Forming a phosphorus envelope: The first structurally characterized cyclooligophosphanide ion [cyclo-(P5tBu4)]− to be obtained by a targeted synthesis reacts with [NiCl2(PEt3)2] by loss of a tBu group to give (η2-3,4,5-tri-tert-butylcyclopentaphosphene)bis(triethylphosphane)nickel(0) (1). The previously unknown cyclopentaphosphene ring in 1 has an envelope conformation in solution and in the solid state, and the tBu groups adopt an all-trans configuration.
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Schisler et al. (2001) studied this question.
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