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In the title compounds, C10H8C12N4 (R= H), (I), and C18H20C12N4O2 (R = COCHMe2), (II), the dihedral angle between the imidazolidine and phenyl rings are 67.7(1) and 70.34(9)°, respectively. In (I), the imidazolidine ring adopts a half-chair conformation, whereas in (II), it is in a flattened envelope conformation.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, IUC9900066-1, IUC9900066-2

fcf

Structure factor file (CIF format)
Contains datablock QB0091I

fcf

Structure factor file (CIF format)
Contains datablock QB0091II

CCDC references: 133650; 133651

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