133673-71-9Relevant academic research and scientific papers
Reactions of an Amino Imino Borane with Phosphinic, Phosphonic, and Phosphoric Acids
Noeth, Heinrich,Schuebel, Juergen
, p. 1687 - 1692 (2007/10/02)
Controlled 1:1 reactions of R2P(O)OH with tmp-B=NtBu (1) (tmp = 2,2,6,6-tetramethylpiperidino group) in hexane leads to R2P(O)OB(tmp)NHtBu (2).In most other cases mixtures of 2 with other products are obtained.Application of a 4:1 ratio of Me2P(O)OH and 1 results in the formation of pure (3).Reaction of phosphonic acids with 1 in hexane at about -30 deg C leads preferentially to the addition of the acid to produce RP(O)2 (4), while H3PO4 reacts with 1 to yield OP3 (6).Species containing tetracoordinated boron atoms are formed as well in dichloromethane as a solvent.Spectral data for the compounds 2, 4, and 6 reveal three-coordinate boron atoms, confirmed by an X-ray structure analysis of 2a (R=CH3).This compound displays a fairly large B-O-P bond angle, 140.6(3). Key Words: Boranes, (tert-butylamino)(diorganylphosphinoyloxy)(tetramethylpiperidino)- / Borates, (tert-butylammonium)tetrakis(dimethylphosphinoyloxy)- / Phosphonates, bis/ Phosphate, tris
