Process for preparing 2,2'-biphenols using selenium dioxide and halogenated solvent
A technology of selenium dioxide and biphenol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., to achieve the effect of satisfying economy and simplifying processing work
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[0089] Hereinafter, the present invention will be explained in detail based on examples.
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[0091] NMR spectroscopy
[0092] NMR spectroscopic studies have been carried out on multinuclear resonance spectrometers of the type AC300 or AVII400 from Bruker Analytical Measurement Technology, Karlsruhe. used CDCl 3 as a solvent. According to the NMR solvent data chart of Cambridge Isotopes Laboratories, USA, it is calibrated according to the remaining content of non-deuterated solvents 1 H-and 13 C-Spectrum. Partially carried out with the help of H, H-COSY, H, H-NOESY, H, C-HSQC and H, C-HMBC-spectroscopy 1 H-and 12C-signal attribution. Chemical shifts are expressed as delta values in ppm. The following abbreviations are used for the multiplicity of NMR signals: s (singlet), bs (broad singlet), d (doublet), t (triplet), q (quartet), m (multiplet), dd (two sets of doublets), dt (two sets of triplets), tq (three sets of quartets). All coupling constants...
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