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Preliminary Weissenberg photographs, showed that crystals of the title compound (C 22 H 26 N 2 O 2 ), belonged to the orthorhombic system with systematic absences consistent with the space group  P 2 1 2 1 2 1 . The unit-cell dimensions and their standard deviation, obtained at room temperature (293 K) were  a  = 10.583(6) Å,  b  = 18.812(2) Å,  c  = 9.962(1) Å,  Z  = 4. The unit cell volume ( V ) was 1983(1) Å 3  and the absorption coefficient ( μ ) was 0.075 mm −1 ,  D  c  was 1.174 and  Dm  measured by flotation was 1.18 Mgm −3 ;  F (000) = 752,  λ  (Mo K α  ) = 0.7107 Å. The structure was solved by direct methods and refined by full-matrix least squares methods to a final  R ( F ) = 0.041 and  Rw ( F  2 ) = 0.12.

Structure of (2 S )-1-[(2 R )-2,4-diphenyl-4-oxobutylideneamino]-2-(methoxymethyl) pyrrolidine