Synthetic and thermochemical studies of fluorinated tertiary phosphine ligands R2PRf [R=Cy, Ph, iPr; Rf=CH2CH2(CF2)5CF3] in an organoiron system
摘要:
The fluorinated phosphine ligands [PR2Rf (R = Cy (2); Pr-i, (3); Ph, (4); R-f = CH2CH2(CF2)(5)CF3] react with Fe(CO)(3)(BDA) (1) (BDA = (C6H5)CH = CHC(O)CH3, benzylideneacetone) to yield the corresponding Fe(CO)(3)(PR2Rf)(2) = (R = Cy, (5) Pr-i, (6) Ph, (7)) complexes. Infrared studies on the carbonyl complexes and solution calorimetry studies of the reaction of 1 with 2, 3 and 4 have been performed to quantify the donor strength of this series of ligands. (C) 2000 Elsevier Science S.A. All rights reserved.
Synthetic, Thermochemical, and Catalytic Studies of Fluorinated Tertiary Phosphine Ligands R<sub>2</sub>PR<sub>f</sub> [R = Cy, Ph, <sup>i</sup>Pr; R<sub>f</sub> = CH‘<sub>2</sub>CH<sub>2</sub>(CF<sub>2</sub>)<sub>5</sub>CF<sub>3</sub>] in Rhodium Systems
作者:Dale C. Smith、Edwin D. Stevens、Steven P. Nolan
DOI:10.1021/ic990430u
日期:1999.11.1
The fluoroalkylphosphine compounds PR2Rf (R = Cy (1); Pr-i (2); R-f = CH2CH2(CF2)(5)CF3) have been prepared from the reactions of the Grignard reagent IMgRf and appropriate ClPR2 (R = Cy, Pr-i). The fluorinated phosphine ligands [PR2Rf (R = Cy (1); Pr-i (2); Ph (3); R-f = CH2CH2(CF2)(5)CF3] react with [Rh(CO)(2)Cl](2) to yield the corresponding [Rh(CO)Cl(PR2Rf)(2)] (R = Cy (4); Pr-i (5); Ph (6)) complexes. Infrared studies on the carbonyl complexes and solution calorimetry studies of the reaction of (Rh(CO)(2)Cl](2) with PR2Rf (R = Ph, Pr-i, Cy) have been used to quantify the relative ligand donor strength for the series: PCy2Rf approximate to (PPr2Rf)-Pr-i > PPh2Rf. The solid-state crystal structure of [Rh(CO)Cl(PPh2Rf)(2)] (6) is reported. Additionally, these partially fluorinated phosphine ligands (1 and 3) can be used as supporting ligation in rhodium-mediated hydrogenation reactions.