1,3-Dimethyl-5-(2-methylbenzylidene)pyrimidine-2,4,6(1H,3H,5H)-trione

Panchatcharam, R.; Dhayalan, Vasudevan; Mohanakrishnan, Arasambattu K.; Chakkaravarthi, G.; Manivannan, V.

doi:10.1107/s1600536809035521

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2011

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“…The bond C5-C6 of 1.453 (2) Å is longer than C3-C5 bond of 1.365 (2) Å that indicates C3-C5 as a formally double bond. This is in accordance with the literature (Panchatcharam et al 2009 andRezende et al 2005).…”

Section: S1 Commentsupporting

confidence: 94%

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5-(3,4-Dimethoxybenzylidene)-1,3-dimethyl-1,3-diazinane-2,4,6-trione

2011

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In the title compound, C15H16N2O5, the dihedral angle between 1,3-diazinane and benzene rings is only 4.27 (1)°. The essentially planar molecular structure is characterized by a short intramolecular C—H⋯O separation and by an exceptionally large bond angle of 138.25 (14)° at the bridging methine C atom. The methoxy groups deviate somewhat from the plane of the benzene ring, with C—C—O—C torsion angles of −15.6 (1) and 9.17 (6)°. In the crystal, molecules form centrosymmetric dimers via donor–acceptor π–π interactions, with a centroid–centroid distance of 3.401 (1) Å.

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Section: S1 Commentsupporting

confidence: 94%

“…For the use of pyridine-type ligands in catalysis models, see: Roodt et al (2011); van der Westhuizen et al (2010). For related structures, see: Panchatcharam et al (2009); Rezende et al (2005). For the synthesis, see: Prajapati et al (2006).…”

Section: Related Literaturementioning

confidence: 99%