Riding model

Vibration corrected bond lengths based on the riding model for C(2)—N(1), rigid body libration for other C—N bonds, libration plus riding motion for N—H bonds. 

The crystal of compound 1 was grown in ethanol solution at room temperature. A yellow crystal of 1, irregularly shaped, of approximate dimensions 0.45x0.50x0.56 mm, was used for crystal and intensity data collection. The crystal structure of 1 was solved by direct method with SHELXTL [17] and refined by full-matrix least squares on F with anisotropic displacement parameters for all non-H atoms. All H-atoms were generated in idealized positions and refined in a riding model. 

Idealized tertiary C—H group with all X—C—H angles equal, subsequently refined using a riding model. 

Idealized secondary CH2 group with all X—C—H and Y —C—H angles equal, refined using a riding model. The H—C—H angle is calculated to be approximately tetrahedral, but is widened if X—C—Y is much less than tetrahedral. 

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