Phosphine, triethyl

The dimensionless acceptor number, AN, ranked the acidity of a solvent and was defined for an acidic solvent A as the relative P NMR downfield shift (A3) induced in triethyl phosphine when dissolved in pure A. A value of 0 was assigned to the shift produced by the neutral solvent hexane, and a value of 100 to the shift produced by SbClj. Gutmann suggested that the enthalpy of acid-base adduct formation be written as ... 

The only oral complex in clinical use is auranofin 92 (Ridaura), containing tetraacetyl-j8-D-thioglucose and triethyl phosphine ligands. Auranofin is a lipophilic complex, a monomer containing linear two-coordinate Au(I). 

Treatment of phosphorus trichloride with an excess of the Grignard reagent (4) leads to the sterically hindered phosphine (5).4 A sample of 14C-labelled triethyl-phosphine has been synthesized from 14C-labelled ethylmagnesium iodide and phosphorus trichloride.5 The reaction of chlorodiphenylphosphine with the Grignard... 

Ohst and Kochi (1986) traced changes in the electron structure that takes place during the substitution of the triethyl phosphine ligand for the carbonyl ligand in the iron-phenylphosphine-carbonyl complex (see Scheme 1.28). 

The cores of the W6 clusters are very similar to those of the Mo6 analogues, and they are composed of the regular octahedra of six tungsten atoms capped by eight sulfur atoms (41, 43, 44). The W-W distances are almost the same, and difference in terminal ligands has little effect on the geometry (Table I). Only in the case of tert-butylpyridine complexes has a very small compression of the octahedron been observed in the c-axis direction (44). The bond order for the W—N bonds in the pyridine complexes is much weaker than that for the triethyl-phosphine analogue (43). 

THE FORMATION OF THE HYDRIDO(METHANOL)BIS(TRIETHYL-PHOSPHINE)PLATINUM(n) CATION AND ITS REACTIONS WITH UNSATURATED HYDROCARBONS... 

A. frans-HYDRIDO(METHANOL)BIS(TRIETHYL-PHOSPHINE)PLATINUM(II) BIS(TRIFLUORO-METH ANESULFON ATE) (1 -)... 

The methanol solution of rans-hydrido(methanol)bis(triethyl-phosphine)platinum(II) slowly decomposes with formation of metallic platinum, if not kept under inert atmosphere. 

Hydrido(Methanol)Bis(Triethyl-Phosphine)Platinum(Il) Cation 137... 

BF404WC,]Hm, Tungsten(l +), (acetone)-tricarbonyl(r 5-cyclopentadienyl)-tetrai1uoroborate(l -), 26 105 BF40,ReC5, Rhenium, pentacarbonyl-[tetrafluoroborato(l —)]-, 26 108 BF405ReC7H4, Rhenium(l+), pentacar-bonyl-(-r)2-ethene)-tetrafluoroborate( 1 —), 26 110 BO PtC Fl, Platinum(II), (3-methoxy-3-oxo-KO-propyl-KC )bis(triethyl-phosphine)-... 

PtB02P2C4 H , Platinum(II), (3-methoxy-3-oxo-KO-propyl-KC )bis(triethyl phosphine)-... 

A remarkable stereospecific dehydrative alkylation of (3-disulfones was reported by Falck et al. [406] under Mitsunobu conditions (triethyl phosphine, diethyl azodicarboxylate). The synthesis of a pheromone component of the lesser tea tortrix emphasizes some of the possibilities offered by coupling this reaction with further uses of the sulfone functionality. In the present case, monodesulfonylation with lithium naphthalenide (-78°C, 5 min), in situ alkylation (-78 to 23°C, 1 h), and Li-naphthalene cleavage of the second sulfonyl group (—78°C, 5 min) yielded in a one-pot procedure a THP ether which was converted into the sought after pheromone through direct acetylation. 

Unfortunately there seems to be no supplementary evidence on copolymerization initiated by phosphines. In a typical experiment, a solution of acrylonitrile in petroleum ether is treated with a little triethyl phosphine. A greenish-brown product settles on the walls of the flask. It is soluble in acetone, furfural, methyl ethyl ketone and DMF. Polymer precipitated from acetone by toluene is of low molecular weight and contains perhaps 0.5% combined phosphorus. In similar experiments it is possible to obtain pale yellow polymers with number average molecular weights of around 30,000 and with about one atom of P per polymer chain. On the basis of these results Horner and coworkers proposed the scheme (72) ... 

Typical Procedure for the Triethyl Phosphine and Chiral Binaphthol-Derived Bronsted Acid Co-Catalyzed Asymmetric MBH Reaction [43] (pp. 173 and 232)... 

A solution of 20.8 g. (55 mmoles) of potassium tetrachloro-platinate(II) in 100 ml. of water is prepared in a 250-ml. suction flask with a nitrogen flow through the sidearm to provide an inert atmosphere. (The procedures work equally well at halfscale.) Triethylphosphine (15 ml., 100 mmoles) is added all at once and the mixture is stirred with a magnetic stirrer at room temperature for one hour. A pink-tan precipitate of tetrakis-(triethylphosphine)platinum(II)tetrachloroplatinate(II) forms. The mixture is heated on a steam bath for one hour. The pink salt dissolves, and a layer of pale yellow dichloro-bis(triethyl-phosphine)platinum forms on the liquid. The solid is filtered, washed with water, crushed in a mortar, and dried under... 

With the exception of a nickel -benzyne complex (13) [Eq. (5)],32,33 which is probably formed by trapping the free intermediate with the coordinatively unsaturated metal,34 all complexes of nickel and platinum have been prepared by reduction of preformed (2-haloaryl)halometal complexes, which in turn have been synthesized by oxidative addition of M(0) to o-diha-loarenes.2 35-37 Typical of this procedure is preparation of the bis(triethyl-phosphine)nickel-benzyne complexes 19 shown in Eq. (6). 

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