Ethylene triphenyl

Acetone Phenylene oxide/styrene Ethylene Triphenyl phosphate plasticizer Phenolic antioxidants... 

Other routes have been tried starting from formaldehyde or paraformaldehyde. One process reacts formaldehyde with carhon monoxide and H2 (hydroformylation) at approximately 4,000 psi and 110°C using a rhodium triphenyl phosphine catalyst with the intermediate formation of glycolaldehyde. Glycolaldehyde is then reduced to ethylene glycol ... 

Triphenyl- [1] and trimethylvinylsilane [2] as well as l,l-bis(trimethylsilyl)ethylene [3] are known to react with lithium metal in THF yielding 1,4-dilithiobutane derivatives by a dimerizing Schlenk addition. Interestingly, by using hexane as the solvent trimethylvinylsilane 1 does not yield the dimer product 2 but a 1 1 -mixture of the corresponding vinyllithium compound 3 and the lithioalkyne 4... 

Dias, M. L. and Silva, A. P. F Transesterification reactions in triphenyl phosphite additivated-poly(ethylene terephthalate)/poly(ethylene naphtha-late) blends, Polym. Eng. Sci., 40, 1777 (2000). 

As a polar solvent for the catalyst ethylene carbonate (EC), propylene carbonate (PC) and acetonitrile were used. Tricyclohexylphosphine, triphenyl-phosphine and the monosulfonated triphenylphosphine (TPPMS) were investigated as ligands with Pd(acac)2 as the precursor. Cyclohexane, dodecane, p-xylene and alcohols (1-octanol, 2-octanol and 1-dodecanol) were tested as non-polar solvents for the product. To determine the distribution of the product and of the catalyst, the palladium precursor and the hgand were dissolved in the polar solvent and twice as much of the non-polar solvent was added. After the addition of 5-lactone, the amounts of the product in both phases was determined by gas chromatography. The product is not soluble in cyclohexane and dodecane, more than 99% of it can be found in the polar catalyst phase. With the alcohols 1-octanol, 2-octanol and dodecanol about 50 to 60% of the 5-lactone are located in the non-polar phase. With p-xylene biphasic systems can only be achieved when EC is used as the polar solvent and even in this solvent system one homogeneous phase is formed at a temperature higher than 70 °C. In a 1 1 mixture of EC and p-xylene about 50 to 60% of the product is contained in the polar phase. 

Cecolene, see Trichloroethylene Cekiuron, see Diuron Cekubaryl, see Carbaryl Cekusan, see Dichlorvos Celanex, see Lindane Celfume, see Methyl bromide Cellon, see 1,1,2,2-Tetrachloroethane Cellosolve, see 2-Ethoxyethanol Cellosolve acetate, see 2-Ethoxyethyl acetate Cellosolve solvent, see 2-Ethoxyethanol Celluflex DOP, see Di-rr-octyl phthalate Celluflex DPB, see Di-rr-butyl phthalate Celluflex TPP, see Triphenyl phosphate Celluphos 4, see Tributyl phosphate Celmide, see Ethylene dibromide Celthion, see Malathion... 

Racemic modifications may be resolved. There are very few examples of this approach having been employed successfully. The racemic cylic ether (RS)-36, which contains two CH2OCH2CO2H arms attached to the 3 and 3 positions on the axially chiral binaphthyl units, has been resolved (48-50, 93, 94) to optical purity in both its enantiomers by liquid-liquid chromatography using a chiral stationary phase of either (R)- or (S)-valine adsorbed on diatomaceous eaitii. Very recently, the optical resolution of crown ethers (/ S)-37 and (/ 5)-38, incorporating the elements of planar chirality in the form of a rron -doubly bridged ethylene unit, has been achieved (95) by HPLC on (+)-poly(triphenyl-methyl methacrylate). 

Resistance to tamoxifen is a complex phenomenon and there is evidence that relapse under tamoxifen therapy is linked to the estrogenicity of the drug. Both, the great success of tamoxifen and its liabilities have boosted the search for new analogues in the past 25 years with the goal of identifying a compoimd with increased anti-tumour activity and with reduced side effects. A second generation of structurally related triphenyl-ethylenes like... 

It is a triphenyl ethylene compound and a competitive partial agonist inhibitor of endogenous estrogen. It can produce regression of estrogen induced proliferative endometrium. It can also prolong the luteal phase in normal menstruating women. 

The Wittig reaction has been used to synthesise the cis and trans isomers of styrylpyrroles (B-77MI30505) and l,2-bis(2-pyrrolyl)ethylenes have been prepared in good yield from the reaction of 2-formylpyrroles with triphenyl(2-pyrrolylmethylene)phosphorane (81UP30500). 

These derivatives fall into two classes, the first containing an unsubstituted nucleus, and the second having alkoxy-groups in the nucleus. The former may be represented by triphenyl selenium chloride, prepared by adding diphenyl selenium dichloride to a suspension of aluminium chloride in dry benzene. This chloride is crystalline, absorbs atmospheric moisture to yield a dihydrate, and decomposes at its melting-point, forming diphenyl selenide and chlorobenzene. Boiling with ethylene dibromide converts it into triphenyl selenium bromide. The hydroxide has not been isolated in the solid state, but salts have been prepared. The alkoxy-derivatives are represented by... 

Triphenyl selenium bromide, (C6H5)3SeBr, is formed when the foregoing chloride is dissolved in boiling ethylene dibromide. It is crystallised from methyl ethyl ketone and melts with decomposition at 236° C., heating at this temperature causing decomposition with formation of diphenyl selenide and bromobenzene. 

The mass spectra of certain metal carbonyl complexes of triphenyl-phosphine and l,2-bis(diphenylphosphino)ethane (Pf-Pf) have been investigated 48>. Besides the usual stepwise loss of carbonyl groups, cleavage of the phosphorus-carbon bond occurs. Thus triphenylphosphine complexes exhibit cleavage of the phenyl-phosphorus bond after all carbonyl groups are lost. The 1,2- bis(diphenylphosphino)ethane complexes (e.g. (Pf-Pf)[W(CO)5]2 and (Pf-Pf)M(CO)4) exhibit elimination of the ethylene bridge between two phosphorus atoms. 

The purity can be checked conveniently by complexometric titration of palladium - after destruction of the complex with sulfuric and nitric acids and by volumetric determination of the ethylene upon displacement with triphenyl phosphite. Anal. Calcd. for C38Hs4P2Pd Pd, 16.1 C2H4, 4.26 C, 69.3 H, 5.2. Found Pd, 16.2 C2H4, 4.06 C, 68.9 H, 4.9. 

Oxidmion of ketone acetals and ethers. Ketones can be regenerated from the ethylene acetal derivatives by treatment with trityl fluoroborate in dry dichloro-methanc (Nj) at room temperature. Thus the reaction of trityl fluoroborate with cyclohexanone ethylene acetal results in cyclohexanone (80%) and triphenylmethane. The reaction thus involves hydride transfer to the triphenyl carbonium ions. Triethyl-oxonium fluoroborate can also be used but is somewhat less effective than trityl fluoroborate. 

Kim and Datta [1991] tested the above concept with the homogeneously catalyzed ethylene hydroformylation by hydridocarbonyltris (triphenyl phosphine) Rh (I) catalyst dissolved in dioctyl phthalate solvent. They concluded that for effective separation of the product, the transport resistance of the catalyst layer should be less than that for the membranes by controlling the liquid loading of the catalyst layer. They also pointed out that the organic membranes used can not withstand the aggressive reaction conditions and suggested that ceramic membranes appear to hold promises for practical applications. 

Anhydro formaldehyde anilin e T rim eric M ethylene aniline or 1,3,5-Triphenyl-trime thy lenetri-amine, Ki C"... 

Triphenyl-jS-hydroxyethylarsonium chloride, (C61Tb)3As(CHj. CHa.0H)Cl, is obtained by heating together trijihenylarsinc and ethylene chlorhydrin. It crystallises m colourless needles, M.jit. 21.5" ( ., and gives a plaitnicJdoride, M.pt. 223 C. 

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