title: Crystal structure of methyl 1-methyl-2-oxo-spiro-[indoline-3,2'-oxirane]-3'-carboxyl-ate.
abstract: In the title compound, C12H11NO4, the dihedral angle between the indole ring system (r.m.s. deviation = 0.019 Å) and the oxirane ring is 88.8 (2)°. The oxirane O atom and the bridging ester O atom are in an approximate syn conformation [O-C-C-O = -25.4 (3)°] In the crystal, inversion dimers linked by pair of C-H⋯O hydrogen bonds generate R 2 (2)(8) loops, where the C-H donor group forms part of the oxirane ring. A second C-H⋯O inter-action arising from one of the C-H groups of the benzene ring links the dimers into [001] double chains.
authors.affiliation: Department of Physics, Queen Mary's College (Autonomous), Chennai 600 004, India.
authors.forename: M P
authors.initials: MP
authors.lastname: Savithri
authors.affiliation: University of Madras, Industrial Chemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Yuvaraj
authors.affiliation: University of Madras, Industrial Chemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, India.
authors.forename: B S R
authors.initials: BS
authors.lastname: Reddy
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: R
authors.initials: R
authors.lastname: Raja
authors.affiliation: Department of Physics, Presidency College (Autonomous), Chennai 600 005, India.
authors.forename: A
authors.initials: A
authors.lastname: SubbiahPandi
keywords: crystal structure; ester; hydrogen bonding; indoline; oxirane; spiro compound