Abstract
t-Butylcyclopentadienyllithium was allowed to react with (2,4,6-tri-t-butylphenyl)phosphonous dichloride to afford the corresponding chloro-5-cyclopentadienylchlorophosphine as a mixture of diastereomers, the structure of one of which was determined by X-ray crystallography. The mixture of 5-cyclopentadienylchlorophosphine diastereomers was treated with a base to furnish novel 2-t-butyl-6-(2,4,6-tri-t-butylphenyl)-6-phosphafulvenes, and each geometrical isomer of them was fully characterized by X-ray crystallography. The E/Z ratio of the 6-phosphafulvene obtained was considerably dependent on the diastereomeric ratio of the chlorophosphine precursor.
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