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Proton NMR determination of the 2,4–/2,6–isomer ratio in commercial toluene di‐isocyanates
Author(s) -
Platten M. R.
Publication year - 1975
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270070611
Subject(s) - toluene , isocyanate , hexafluorobenzene , proton , chemistry , solvent , proton nmr , analytical chemistry (journal) , benzene , organic chemistry , nuclear physics , physics , polyurethane
The CH 3 ‐proton resonances for the 2,4‐ and 2,6‐isomers of toluene di‐isocyanate separate when hexafluorobenzene is used as a solvent. Integration of these absorptions over an expanded sweep scale gives the isomer ratio with an accuracy of ±0.5% over the range normally encountered with commercial samples.