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Synthesis and properties of bis(dialkylphosphino)ethane iron dihydrides
Author(s) -
Baker Murray V,
Field Leslie D,
Young David J
Publication year - 1990
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.590040517
Subject(s) - chemistry , protonation , reagent , hydride , nuclear magnetic resonance spectroscopy , medicinal chemistry , cis–trans isomerism , lithium (medication) , inorganic chemistry , stereochemistry , organic chemistry , ion , metal , medicine , endocrinology
Syntheses and properties of the iron bisphosphinoethane complexes FeH 2 (PP) 2 and FeHCl(PP) 2 [PPR 2 PCH 2 CH 2 CH 2 PR 2 , where RMe (PPDMPE), Et(PPDEPE), and n‐Pr (PPDprPE)] are reported. The complexes can be formed by reduction of the corresponding dichlorides FeCl 2 (PP) 2 with lithium aluminium hydride in THF solution provided that ethanol or more acidic reagents are not employed during the reaction work‐up. The dihydrides are notably basic compounds and can be protonated reversibly by alcohols. The dihydrides exist as equilibrating mixtures of cis and trans isomers in solution. The cis isomers of each of the dihydrides are fluxional on the NMR timescale and NMR studies indicate that the interconversion of cis isomers does not necessarily proceed via the trans isomer.