104953-85-7Relevant academic research and scientific papers
31P-N.M.R. Investigation and Alkylation of N-Hetaryl-triphenylphosphanimides: Estimation of ?--Constants for Several N-Ring Systems from the 31P Chemical Shifts
Boedeker, J.,Koeckritz, A.,Koeckritz, P.,Radeglia, R.
, p. 723 - 730 (2007/10/02)
On the basis of a Hammett-like relationship we have used the 31P chemical shifts of N-hetaryl-triphenylphosphanimides 2 to estimate ?--constants resp. ?--differences of several N-heteroaromatic rings.The electron-withdrawing influence of these rings on the P chemical shift is additionally increased by a short-range electrical field and magnetic anisotropy effect respectively in case the phosphazene group is linked with the α-position of the hetarene.If one aza substituent is neighbouring to the detector group, this through space effect leads to a downfield shift of about 7 ppm.All compounds are alkylated with methyliodide at the ring N atoms and give the quaternary salts 3.The pyridine-N-oxide derivative 2n exists in the open-chain form and reacts with methyliodide at the O atom.
