Reaction of a methanolic copper(II) acetate solution of enantiomerically pure (5R)‐/(4S)‐methyl E‐(4‐ethyl‐2‐oxazolidinylidene)cyanoacetate 6 leads to the mononuclear chelate complexes (R, R)‐/ (S, S)‐7. Recrystallization of (R, R)‐/(S, S)‐7 from non‐coordinating chloroform and asymmetric induction via the stereogenic centers, originating from (R)‐/(S)‐6, stereospecifically yield the right‐ and left‐handed helical ID‐coordination polymers (P)‐/(M)‐8. The structures of mononuclear complex (R, R)‐7 and of helix (P)‐8 and its mirror image (M)‐8 have been characterised unequivocally by X‐ray crystal structure analyses. (P)‐ and (M)‐8 crystallize with chloroform to give the clathrates 1.{[CuLR2]. 2 CHCl3} and 1.{[CuLS2].2CHCl3}, respectively.
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Saalfrank et al. (1997) studied this question.