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The title compound (S,S)-2, has been obtained by reduction with Li[AlH 4 ] of the cyclopentane- 1,2-diyl-bis(1′,3′,2′-dioxaphospholane) (1S ,2S)-trans-C 5 H 8 [P(OCH (CO 2 Pr-i)- (R) - ) 2 ] 2 , (S,S)-1, which itself was isolated in diastereomerically pure form (X-ray structure analysis) from the reaction between rac, trans-C 5 H 8 (PCl 2 ) 2  and (2R,3R)-(+)-diisopropyl tartrate. Cleavage of (S,.S)-1 withPCl 3  yielded an unseparable mixture of (1S,2S)-trans-C 5 H 8 (PCl 2 ) 2  and (4R.5R) -ClP [OCH(CO 2 Pr-i)-] 2 .

zeitschrift für naturforschung b

Oligophosphan-Liganden, XXXIX. (1S,2S)-trans-Cyclopentan-1,2-diyl-bis(phosphan), C 5 H 8 (PH 2 ) 2 , durch Reduktion eines diastereomerenreinen Cyclopentandiyl-bis(dioxaphospholans) / Oligophosphine Ligands, XXXIX. (1 S,2S)-trans-Cyclopentane-1,2-diyl-bis(phosphine), C 5 H 8 (PH 2 ) 2 , by Reduction of a Diastereomerically Pure Cyclopentanediyl-bis(dioxaphospholane)