13466-74-5Relevant academic research and scientific papers
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).
