Perpendicular Conformation of 2-Cyanoethyl Group

In order to examine the asymmetric induction, a cobaloxime complex with S-2-butylamine (S-2ba) as an axial base ligand was prepared since the amine is the simplest [15]. The crystal structure is shown in Fig. 5.19. There is one molecule in an asymmetric unit of the Cl cell. The molecules are aligned along the a axis. The molecnlar structnre is shown in Fig. 5.20. The 2-ce group takes a perpendicular conformation to the cobaloxime plane and has disordered conformations (A, B, and C) aronnd the Co-C bond. 

After many trials, it was successful to observe the photoisomerization of the S-2ba complex crystal without degradation of the single crystal form, although the occupancy factor of the produced 1-ce group was only 13 % [15], Since the R-2ba, not the S isomer, was used as an axial base ligand, the configuration of the produced 

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