Acta Cryst. (2006). E62, o3699-o3700  [ doi:10.1107/S1600536806030418 ]

Isopropylideneamino-12H-dibenzo[d,g][1,3]dioxocine-6-carboxylate

R.-F. Jin, H.-Y. Ji, D. Xiang and B. Li

Abstract: The structure of the title compound, C₁₈H₁₇NO₄, an inhibitor of acetolactate synthase (ALS) and a promising candidate for an effective wheat herbicide, features a dioxaoctane ring fused with two benzene rings; the conformation of the eight-membered ring has approximate local mirror symmetry, but is not close to any of the canonical shapes of eight-membered rings. The dihedral angle formed by the planes of the benzene rings is 74.6 (1)°; only one of the endocyclic atoms, viz. the one carrying the azavinylidenecarboxylate substituent, shows substantial displacements [1.147 (6) and 1.234 (6) Å] from both of the benzene ring planes.

Online 9 August 2006

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