38327-00-3Relevant academic research and scientific papers
Resolution of secondary phosphanes chiral at phosphorus by means of palladium metallacycles
Albert, Joan,Cadena, J. Magali,Granell, Jaume,Muller, Guillermo,Panyella, David,Sanudo, Carolina
, p. 1283 - 1286 (2007/10/03)
The synthesis of new epimeric compounds [PdCl(C-N){(±)-PHPhR}] (C-N = (R)-C10H6CHMeNH2 and (R)-C6H4CHMeNH2, R = Me and PhCH2) containing chiral secondary phosphanes is reported. Some of these diastereomers can be separated by column chromatography; subsequent re- action of these complexes with 1,2-bis(diphenyiphosphanyl)-ethane (dppe) affords the free phosphanes PHBzPh and PHMePh. The configurational stability of the secondary phosphanes resolved has also been studied.
Synthesis and N.M.R. Studies of New Unsymmetrically Substituted Ditertiary Phosphines
Bowmaker, Graham A.,Williams, Julian P.
, p. 451 - 460 (2007/10/02)
The synthesis and characterization of rac- and meso-(E)-1,2-C2H2(PMePh)2 (1), 1,2-C6H4(PMePh)(PPh2) (2), 1,2-C6H4(PBuPh)(PPh2) (3) and 1,2-C6H4(PMe2)(PPh2) (4) are reported.Reaction of (1) with MeI (1:2) gives I2 (5).The compound I (6) was synthesized from (E)-1,2-C2H2(PPh2)2 and MeI (1:1). 1H n.m.r. spectra are reported for (2), (3), (5) and 6. 31P n.m.r. spectra are reported for (1)-(3), (5), (6) and I2 (7). 2J(P(V),H) and trans 3J(H,H) coupling were observed in the 1H n.m.r. spectra of (6).Substitution of one Ph group for one Me group at phosphorus in a ditertiary phosphine produces a change in chemical shift of 19.5 and 21.8 ppm for (E)-CH=CH and 1,2-C6H4 interphosphorus linkages respectively.The interphosphorus linkage in a ditertiary phosphine produces large 3J(P,P) coupling constants (c. 155 Hz), and an increase in screening of the phosphorus nuclei (c. 10 ppm).
