Aminodiphenylphosphanes: Isotope‐induced chemical shifts ¹Δ^14/15N(³¹P), coupling constants ¹J(³¹P,¹⁵N), and chemical shifts δ¹⁵N and δ³¹P

Abstract

A series of aminodiphenylphosphanes 1 [Ph 2 P-N(H)tBu (a), -NEt

Phosphorylation of Diaminopyridines: Synthesis of a Compound Containing Both a Diphosphinoamine (P–N–P) and an Iminobiphosphine (N=P–P) Fragment

“…Phosphorylation reactions can be conveniently monitored using 31 P NMR spectroscopy as the phosphorylated products give characteristic peaks with significant differences in their chemical shifts 31. For the phosphorylation of aniline and aminopyridine with PPh 2 Cl, the partially phosphorylated products containing the NH–PPh 2 moiety give rise to a singlet at ≈ 35 ppm,32,33 and the fully phosphorylated diphosphinoamine species displays a peak at ≈ 65 ppm 34. The presence of other substituents on the benzene or pyridine rings causes relatively small changes in the frequency of these characteristic signals.…”

Aminophosphanes with bulky amino groups: Molecular structure, coupling constants 1J(31P, 15N) and 2J(31P, 29Si), and isotope‐induced chemical shifts 1Δ14/15N(31P)

“…The application of polarization transfer, based on small long-range scalar 15 1, 7, 12, 19, 20) in the same way as has been shown for other aminophosphanes [8,9,19,20]. The lone pair of electrons at the phosphorus atom is mainly responsible for the negative contributions to 1 K( 31 P, 15 N) [21].…”

“…SCHEME 2 Proposed preferred conformation of 3. Comparison of 15 N and 13 C NMR data of 3 with related 2-aminopyridine derivatives [9,36].…”

“…Trimethylsilylaminophosphanes have been studied focusing on 1 H, 13 C, 29 Si, 31 P NMR data and on coupling constants 2 J ( 31 P, 29 Si) [7], and a second report has dealt with similar topics together with 15 N NMR parameters and isotopeinduced chemical shifts 1 14/15 N( 31 P), with emphasis on (Me 3 Si) 2 N-PMe 2 and derivatives [8]. Recently we determined 1 14/15 N( 31 P) values and 15 N NMR parameters for a series of aminodiphenylphosphanes [9]. The present work covers similar aspects of some analogous N-trimethylsilyl derivatives 1-5.…”

Synthesis and Molecular Structure of β‐Phosphinoyl Carboxamides: An Unexpected Case of Chiral Discrimination of Hydrogen‐Bonded Dimers in the Solid State

“…Materials : P ‐Isopropylamino‐ P , P ‐diphenylphosphane,18 P ‐ tert ‐butylamino‐ P , P ‐diphenylphosphane,19, 20 P , P ‐diphenyl‐ P ‐(4‐tolylamino)phosphane,21 and P ‐4‐methoxyphenylamino‐ P , P ‐diphenylphosphane22 were prepared by published procedures.…”