Digital research materials of spectral data for the article: [3+2]-Cycloaddition of azomethine ylides to 5-methylidene-3-aryl-2-сhalcogen-imidazolones: Access to dispiro indolinone-pyrrolidine-imidazolones

Digital research materials of NMR spectral data for the article \"[3+2]-Cycloaddition of azomethine ylides to 5-methylidene-3-aryl-2-сhalcogen-imidazolones: access to dispiro indolinone-pyrrolidine-imidazolones\" submitted to the Royal Society Open Science. NMR spectra were recorded on Bruker Avance 400 and Agilent MR-400 spectrometers in DMSO-d6 and C6D6.  Chemical shifts were measured relative to residual solvent signals and referenced in parts per million to TMS. Original fid files are presented, which can be opened, for example, using the ASD Labs software package.