127332-18-7Relevant academic research and scientific papers
Tetraethylborate as an ethyl transfer reagent
Thaler, Eric G.,Caulton, Kenneth G.
, p. 1871 - 1876 (1990)
Reaction of NaBEt4 with RhCl(C2H4)(triphos) (I), where triphos is MeC(CH2PPh2)3, gives RhH-(C2H4)(triphos). Coordinated 13C2H4 in labeled I is liberated during the reaction, proving that NaBEt4 is the source of the ethylene coordinated in the product. Compound I reacts at 1 atm and 25°C with 13C2H4 or H2 to give RhCl(13C2H4)(triphos) or Rh(H)2Cl(triphos), respectively. It is proposed that all three reactions proceed by a mechanism in which one arm of the triphos ligand in I dissociates to yield a planar RhCl-(C2H4)(η2-triphos) transient. Both five-coordinate species RhX(C2H4)(triphos) (X = H, Cl) are unusual in showing relatively high barriers for both phosphorus site exchange and olefin rotation. In contrast to the reaction of I with NaBEt4, the reaction with NaBPh4 stops at Rh(η2-triphos) (η6-PhBPh3) and shows no further conversion to RhPh(C2H4)(triphos).
