Triphenylphosphine derivative

A set of core-functionalized dendrimers was synthesized by Van Leeuwen et al. and one compound was applied in continuous catalysis. [45] The dendritic dppf, Xantphos and triphenylphosphine derivatives (Figures 4.22, 4.30 and 4.31) were active in rhodium-catalyzed hydroformylation and hydrogenation reactions (performed batch-wise). Dendritic effects were observed which are discussed in paragraph 4.5. The dendritic rhodium-dppf complex was applied in a continuous hydrogenation reaction of dimethyl itaconate. 

Figure 4.32. Triphenylphosphine derived dendrimer Figure 4.33. Xantphos-derived dendrimer...

Method A TEBA-Cl (0.33 g, 1.5 mmol) in aqueous NaOH (5M, 45 ml) is added with stirring to CH2=CHCH2Br (1.8 g, 15 mmol) and the metal carbonyl halide (3 mmol) in PhH or CH2C12 (10 ml). The mixture is stirred at room temperature for ca. 20 min and then worked up and converted into the triphenylphosphine derivative by the procedure described in 8.1.1. 

Here we describe the easy synthesis of [Ru(CO)2Cl3(DMF)] . This compound is produced by the reaction of RuCl3 xH20 with the carbon monoxide generated in situ by the decarbonylation of the solvent, dimethylformamide, in the presence of dry HCl. As an illustration, this intermediate is then used to prepare a triphenylphosphine derivative, namely, cis, cis, fra i-Ru(CO)2Cl2(PPh3)2. ... 

Ionic Interactions as a Means to Form Heterobidentate Assembly Ligands 271 Table 10.5 Reaction of triphenylphosphine derivatives and Pt(l,5-cod)Cl2. ... 

All monophosphorus ligands used are meta-substituted triphenylphosphine derivatives. Their structural similarity ensures that they will also have similar binding properties to transition metal central atoms, and the distribution of the complexes will be influenced by the interactions of the functional groups only. 

When a large excess of olefin was used, the cobalt hydrocarbonyl was completely used up in Eq. (2), and Eq. (3) did not occur. In this case the products have been recovered as the triphenylphosphine derivatives, or as the esters by reaction of the acylcobalt carbonyls with iodine and an alcohol. 

Trimethylene oxide also reacts rapidly with cobalt hydrocarbonyl and carbon monoxide at 0° C to produce 4-hydroxybutyrylcobalt tetracarbonyl, identified by means of its triphenylphosphine derivative, and the reaction of the tetracarbonyl with dicyclohexylethylamine to produce y-butyrolactone... 

The formation of the pentacoordinate species (XX) is also supported by the reaction of the triphenylphosphine derivative (XXI) with CO in methanol to give, besides allyl methyl ether, methyl butenoate (14). 

Complexes of Pd and Pt were synthesized by the reaction of cis- or /raw.v- ML2CI2] (M = Pd or Pt L = PEt3 or AsEt3) with triphenyllead lithium in ether at low temperature (equation 182). The red solution produced yellow crystalline solids of trans-[ML2(PbPh3)2] complexes506. These complexes are thermally stable however, attempts to prepare the corresponding triphenylphosphine derivatives were unsuccessful. 

In the crystalline triphenylphosphine derivative 35> both iron atoms are on the same side of the plane defined by the allenic carbons. The stereoscopic drawing of the complex reproduced in the communication is particularly revealing of geometrical character 35>. Unfortunately, no evidence could be obtained regarding the angle between an HCH plane and the CCC plane they certainly need not be identical 56>. One hopes that similar complexes of tetramethylallene will soon be synthesized and structurally clarified. 

Tris- and tetrakis(triphenylphosphine) derivatives of zerovalent platinum can be obtained by reduction of platinum(II) tri-phenylphosphine compounds by alcoholic potassium hydroxide or hydrazine. 1 The tris(triphenylphosphine) derivative is easily obtained from the tetrakis derivative by treatment with hot ethanol, t... 

Another possibility in the method is the reaction via a 3-hydroxydiphenylphosphine oxide. Deoxygenation takes plaee with retention by means of triphenylphosphine derivatives ArsP=X (X = S, Se). (Eq. 103). Triphenylphosphine itself has often been employed in deoxygenation of oxiranes and thiiranes. 

Thus, reaction of Cl2Ru(PPh3)3 or < 2 11(1 1 13)3 with 2,2-diphenylcyclopropene in benzene or methylene chloride yields the desired ruthenium carbene complex in quantitative yield. Typical alkylidene resonances for ll and are observed at =17.94 and 288.9 ppm (both in C, )(,). Despite a ratio of kj/kp <1, the compound was reported to be an efficient initiator for the polymerization of NBE. The rather low activity of the bis(triphenylphosphine) derivative for other cyclic olefins than NBE such as bicyclo[3.2.0]hept-6-ene or trans-cyclooctene was successfully enhanced by phosphine exchange with more basic analogues such as tricyclohexyl-phosphine and tri-i-propylphosphine (Scheme 5.12) [164]. 

Treatment of epoxides with HCo(CO)4 affords /3-hydroxyacylcobalt complexes, which may be isolated as triphenylphosphine derivatives (XV) (127) ... 

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