title: Spiro-[1,3-dioxolane-2,3'-indolin]-2'-one.
abstract: The title compound, C(10)H(9)NO(3), was synthesized by the condensation reaction of isatin (systematic name 1H-indole-2,3-dione) with glycol in presence of p-toluene-sulfonic acid. The indol-2-one ring system is essentially planar [N-C-C-C torsion angle = 3.1 (2)°], and the 1,3-dioxolane ring is slightly distorted. The crystal structure exhibits inter-molecular N-H⋯O hydrogen bonds.
authors.forename: Yan
authors.initials: Y
authors.lastname: Meng
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Miao