Biospin ascend 400 spectrometer

Unless otherwise state, materials were obtained from commercial suppliers and purified by distillation. ¹H NMR spectra were recorded on a JEOL JNM-ECS400 (400 MHz) spectrometer or JEOL JNM-ECX400 (400 MHz) FT spectrometer in CDCl₃ as the solvent with tetramethylsilane (TMS) as an internal standard. ¹³C NMR spectra were taken mainly on JEOL JNM-ECS400 (100 MHz) and JEOL JNM-ECX400 (100 MHz) FT spectrometers in CDCl_3.³¹P NMR spectra were recorded on a JEOL JNM-ECX400 (162 MHz) FT spectrometer in CDCl₃ with 85% H₃PO₄ solution as an external standard or a Bruker BioSpin Ascend 400 spectrometer (162 MHz). ¹⁹F NMR spectra were recorded on a Bruker BioSpin Ascend 400 spectrometer (377 MHz). IR spectra were recorded on JASCO FT/IR-680Plus instrument. High-resolution mass spectra (HRMS) were recorded on a Bruker micrOTOF II ESI(+)/TOF instrument.

Unless otherwise stated, all starting materials were purchased from commercial sources and used without further purification. Ditellurides 2b and 2c were synthesized by the previously reported method [50 (link)]. All solvents were distilled before use. ¹H NMR spectra were recorded in CDCl₃ using the JEOL JNM-ECX400 (400 MHz) FT NMR, JEOL JNM-ECS400 (400 MHz) FT NMR (Tokyo, Japan), and the Bruker BioSpin Ascend 400 spectrometer (400 MHz) (Tokyo, Japan) with Me₄Si as the internal standard. ¹³C{¹H} NMR spectra were recorded in CDCl₃ using the JEOL JNM-ECX400 (100 MHz) FT NMR, JEOL JNM-ECS400 (100 MHz) FT NMR, and the Bruker BioSpin Ascend 400 spectrometer (100 MHz). The characterization data of compounds are shown as follows (¹H and ¹³C{¹H} NMR spectra are included in the Supplementary Materials).