A monoclinic polymorph of N,N′-bis(2,6-diisopropylphenyl)formamidine
نویسنده
چکیده
A new polymorph of N,N'-bis-(2,6-diisopropyl-phen-yl)formamidine, C(25)H(36)N(2), is reported, which is different from the previously reported ortho-rhom-bic structure. The mol-ecule crystallizes in the E-anti configuration, with tautomeric disorder of the N-bonded H atoms and no clear distinction between imine and amine functionalities. The mol-ecules form hydrogen-bonded dimers with inter-molecular N⋯N distances shorter than those in the ortho-rhom-bic polymorph.
منابع مشابه
N 1,N 2-Bis(2,6-dimethylphenyl)-N 1-hydroxyformamidine N,N′-bis(2,6-dimethylphenyl)-N-oxidoformamidinium dichloromethane solvate
The title compound, 2C(17)H(20)N(2)O·CH(2)Cl(2), was obtained by N-oxidation of the parent formamidine with m-chloro-peroxy-benzoic acid (m-CPBA). This is the first use of the above-mentioned synthetic route for the preparation of hydroxy-amidines. The title compound crystallizes as a cyclic dimer resulting from the presence of O-H⋯O and N-H⋯N hydrogen bonds.
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The structure of the title compound, pentoxifylline, C(13)H(18)N(4)O(3), has been previously characterized as a triclinic polymorph [Pavelčík et al. (1989 ▶). Acta Cryst. C45, 836-837]. We have discovered the monoclinic form. There are no strong hydrogen bonds in the crystal structure, rather, moderate C-H⋯O hydrogen bonds are present, which serve to stabilize the three-dimensional architecture.
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عنوان ژورنال:
دوره 64 شماره
صفحات -
تاریخ انتشار 2008