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cis-1-(Diphenylphosphino)-3-(diphenylphosphinomethyl)cyclopentane (13a) and the corresponding dicyclopentylphosphino derivative 13b have been readily obtained in high yield from 2-cyclopentenone by a five-step sequence which takes advantage of the electrophilic character of positions 1 and 3 of 2-cyclopentenone to introduce the substituents, while their relative cis-configuration is established by diastereoselective hydrogenation of the mixture of isomeric alkenes 12a or 12b.

Easy access to cis-1,3-disubstituted cyclopentane 1,4-diphosphines