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Nuclear Magnetic Resonance Studies of Tertiary Phosphines Adducts with Titanium Tetrachloride, using 1 H and 31 P
Author(s) -
Calderazzo F.,
Losi S. A.,
Susz B. P.
Publication year - 1971
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19710540425
Subject(s) - chemistry , adduct , phosphine , chemical shift , nuclear magnetic resonance spectroscopy , carbon tetrachloride , titanium , proton , proton magnetic resonance , spectroscopy , infrared spectroscopy , spectral line , nmr spectra database , nuclear magnetic resonance , stereochemistry , organic chemistry , physics , quantum mechanics , catalysis , astronomy
Proton and 31 P NMR. spectra in solution of several TiCl 4 PR 3 systems have been measured at variable temperatures. The results suggest the presence of fast equilibria in solution involving 1:1 and 1:2 adducts, and free tertiary phosphine. In addition there is evidence for the probable existence, at low temperature, of binuclear species of the type Ti 2 Cl 8 (PR 3 ). Correlations are found between the 31 P chemical shifts for the 1:1 adducts on the one hand, and Taft 's constants and half‐neutralisation potentials on the other. Some new 1:1 and 1:2 TiCl 4 PR 3 adducts have been isolated and have been characterised by analysis and infrared spectroscopy.