1.1.2.2- Tetrakis ethane

C8H32Clftl2N80igPt2, Bis(1,2-diaminoethane)platinum(II)-bis(1,2-diam-inoethane)diiodoplatinum(IV) tetraperchlorate, 45B, 1024 C8H32Cli,N8Ni2, (RS)-Di-M"chloro-tetrakis( ethane-1, 2-diamine )nickel-(II) dichloride, 44B, 802 45B, 1025 CbHb 2Cl4NeNi 2, Di-M Chloro-bis(bisethylenediaminenickel) dichloride, 45B, 1025... 

CbHb 2CliiN8Ni2O8, (RS)-Di-jU Chloro-tetrakis(ethane-1, 2-diamine)nic-kel(II) diperchlorate, 44B, 802... 

Tetrakis (4-hydroxyphenyl)ethane is prepared by reaction of glyoxal with phenol in the presence of HCl. The tetraglycidyl ether [27043-37-4] (4), mp ca 80°C, possesses a theoretical epoxide functionaUty of four with an epoxy equivalent weight of 185—208 (4). 

Ethane, (K)-l-cyclohexyl-L2-bis(diphenylphosphino)-rhodium complexes asymmetric hydrogenation, 6,253 Ethane, tetracyano-metal complexes, 2,263 Ethane, tetrakis(aminomethyl)-metal complexes, 2, 56 Ethane, tris[l, 1, l-(trisaminomethyl)]-complexes structure, 1,26... 

The inherent chemistry above is not altered by substituting the phenyl rings of the ketone or pinacol with methyl groups. The ketone 4,4 -dimethylbenzophenone, as well as the pinacol 1,2,2-tetrakis-(4-methylphenyl)ethane-l,2-diol (TBP) react with U giving tetrakis-(4-methylphenyl)ethylene and l,l, ,2-tetrakis(4-methylphenyl)ethane. A lsl mixture of benzophenone and 4,4-dimethylbenzophenone gives the six expected coupling products. 

An iridium(I) complex with the l,2-bis(tcrt-butylmethylphosphino)ethane (4) and tetrakis(3,5-bis(trifluoromethyl)phenyl)borate as the counter anion catalyzes the hydrogenation of several acyclic aromatic Ai-arylimines under atmospheric hydrogen pressure at room temperature, giving the desired chiral amines with high-to-excellent enantioselectivities (up to 99%, Fig. 6) [19]. The authors also tested (S )-BINAP (Fig. 1) and (/ )-Ph-PHOX (PHOX = 2-[2-(diphenylphosphino) phenyl]-4,5-dihydrooxazole) hgands with lower enantioselectivities [19]. Both steric and electronic properties of the ligand and the combination with the BArF anion are in the base of the efficacy of this catalytic system. On the other hand, attempted hydrogenations of Ai-(2,2,2-trifluoro-l-phenylethylidene)aniline and M-(l,2,2-trimethyl-propylidene)aniline under the same conditions resulted in... 

Several of this group are explosives of moderate to considerable sensitivity to impact or friction and need careful handling. Fluorodinitromethane and fluorodini-troethanol are also vesicant [l]-[4]. l-Fluoro-l,l-dinitro derivatives of ethane, butane, 2-butene and 2-phenylethane are explosive [5]. Among the preparations of a series of energetic and explosive compounds, that of A(A(Al, Al -tetrakis(2-fluoro-2,2-dinitroethyl)oxamide is especially hazardous, as it involves heating an imdiluted explosive to a high temperature [6]. 

Poly(pyrido[3,4- ]pyrazine vinylene) 693 has been synthesized via condensation of 3,4-diamino-2,5-dibtomopyridine 691 with l,2-bis[3-(2 -ethylhexyloxy)phenyl]-ethane-l,2-dione 692 followed by coupling with l,2-bis(tri- -butyl-stannyl)ethylene in DMF at 110°C in the presence of tetrakis(triphenylphosphine)palladium. The vinylene polymer 693 showed improved stability toward photooxidation compared with similar polymers with purely aliphatic side chains and also had smaller band gaps (Equation 58) <2002SM(131)53>. 

An alternative hydrazine derivative used is 3 -methyldithiocarbazate, which is reported to react with tetracya-noethylene via a charge-transfer complex, giving a mixture of polysubstituted pyridazine 9 and pyridazino[4,5-rfjpyridazine 10 <1995PS(101)189>. l,4,5,8-Tetrakis(4-methoxyphenyl)pyridazino[4,5-4]pyridazine 11 has also been prepared by cyclization of tetrakis(4-methoxyphenyl)ethane with hydrazine itself <2000RJ01157>. 

C30H24O4P2W, Tungsten(O), tetracarbonyl 1,2-bis(diphenylphosphino)ethane -, 34 108 C32Hi2BF24Na, Borate, tetrakis(3,5-bis(trifluoro-methyl)phenyl)-, sodium salt, 34 5 C32H29FeNP2, Iron(II), cyano( ) -cyclopentadie-nyl)-l,2-bis(diphenylphosphino)ethane-, 34 161... 

Ci28Hii6Fi2FegN4PioS4, Iron, tetrakis- /i-cyano(T) -cyclopentadienyl)-(l,2-bis(diphenylphosphino)ethane)iron -tetra(/43-thio)tetra-, hexafluorophosphate, 34 164... 

Tetrakis(phenyldifluorophosphine)nickel-(0) could also be obtained, using arsenic trifluoride in the presence of catalytic amounts of antimony pentachloride, or zinc fluoride as fluorinating agents. Yields as high as 50% could be obtained, but sizable decomposition on the process of fluorination of the chlorophosphine nickel-(0) complexes in solution could not be entirely suppressed. The marked instability of zerovalent nickel-phosphine complexes in solution in organic solvents, even under strictly anhydrous and anaerobic conditions, has been noted by several workers (16,20), but is still lacking a detailed explanation. A closer examination of the system carbon tetrachloride-tetrakis(trichlorophosphine)nickel-(0) (23) showed the main pa h of the reaction to consist in the formation of hexachloro-ethane with conversion of zerovalent into bivalent nickel, while the coordinated... 

C28H28014P2S4 4 Na, Benzenesulfonic acid, 3,3, 3",3" -[( 1,2-dimethyl-1,2-ethane-diyl)diphosphinylidyne]tetrakis-, tetraso-dium salt, [118013-34-6],... 

Palladium(II) trifluoroacetate, 236 Sodium borohydride-Tetrakis(tri-phenylphosphine)palladium(O), 168 Tetrakis(triphenylphosphine)palla-dium(0), 34, 103, 126, 142, 169, 202, 211, 220, 271, 289 Tetrakis(triphenylphosphine)palla-dium(0)-l, 2-Bis(diphenylphos-phine)ethane, 290 Tetrakis(triphenylphosphine)palla-dium(0)-Zinc, 346 Tributyltin hydride-Dichlorobis-(triphenylphosphine)palladium(II), 319... 

Stereoselective allylic alkylations have been carried out with the aid of palladium catalysts. The 17-(Z)-ethylidene groups of steroids (obtained from the ketones by Wittig olefination) form n-allyl palladium complexes in the presence of copper(n) salts (B.M. Trost, 1974, 1976). Their alkylation with dimethyl malonate anions in the presence of 1,2-ethane-diylbis[diphenylphosphine] (— diphos) gives a reaction exclusively at the side chain and only the (20S) products. If one starts with the endocyclic 16,17 double bond and replaces an (S)-20-acetoxy group by using tetrakis(triphenylphospbine)palladium,the substitution occurs with complete retention of configuration, resulting from two complete inversions (B.M. Trost, 1976). 

Maeda, K., Okamoto, Y., Toledano, O., Becker, D., Biali, S. E., and Rappoport, Z. (1994) Multiple buttressing interactions enantiomerization barrier of tetrakis(pentamethylphenyl)ethane, J. Org. Chem. 59, 5473-5475. 

Polyglycidyl ether of l,l,2,2-tetrakis-(4-hydroxyl phenyl) ethane Tetrahydrofuran Solid epoxy resin Polyvinyl formal resin Aluminum dust Diaminodiphenyl sulfone 80 55 20 10 100 24.5... 

TCNE = Tetracyanoethylene Dipdba = 4,4 -diisopropyl(di-benzylideneacetone) TMM = Trimethylenemethane dppm = (Diphenylphosphino)methane MMLCT = Metal-metal bond to ligand charge-transfer Tp = Hydrido(trispy-razolyl)borate Tp = Hydridotris(3,5-dimethyl-pyrazolyl)bo-rate BAr = (3,5-triflnoromethylphenyl)borate ttab = l,2,4,5-tetrakis(l-iV-7-azaindolyl)benzene tmeda = Tetra-methylethylenediamine bpma = Bis(pyridyhnethyl)amine TFE = Triflnoroethanol dtbpm = Bis(di-terr-butylphosphi-no)methane dmpe = Bis(dimethylphosphino)ethane dcpe = Bis(dicyclohexylphosphino)ethane triphos = Bis(2-diphe-nylphosphinoethyl)phenylphosphine COD = 1,5-cycloocta-diene dppbts = (Diphenylphosphinobutane)tosylate sodium PPE = Poly(jo-phenylene ethylene). 

Methylenecyclopentanes. 2-Acetoxymethyl-3-allyltrimethylsilane (1) adds to a variety of electron-deficient alkenes in the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium(0) and l,2-bis(diphenylphosphino)ethane to afford methylenecyclopentanes. The allylsilane 1 is prepared in four steps from methallyl alcohol. 

L = l,l.l-tris-(diphenylphosphinomethyl)ethane L = 2,6-di(diphenylphosphinomethyl)pyTidine L = 2,6-di(diphenylphosphmoethyl)pyridine L = 2,3,5,6-tetrakis-(6-methyl-2-pyridyl)pyrazine ... 

Ethan 1,2-Bis-[trimethylsilyl]-l, 1,2,2-tetrakis-[methylthio)- E19a, 735 (Dehydrodimerisierung)... 

Alkynes including acetylene 23), propyne 117), 2-butyne 90, 118), di-ferf-butyl acetylene 117), and diphenylacetylene 112) react readily at room temperature with 1 mole of B2CI4 to form the corresponding vicinal bis(dihaloboryl)olefins. In the case of acetylene, Urry 101) has mentioned the formation at 80° C of a solid complex from which the reagents can be recovered and which slowly reacts to form the 1 1 diboration product. Addition of a second mole of B2CI4 to the olefinic 1 1 addition product has been described only in the case of acetylene. The product, 1,1,2,2-tetrakis-(dichloroboryl)ethane is a solid, m.p. 29°-30°C, stable to 200° C and monomeric in the vapor 24). Addition of B2F4 to acetylene in 1 1 ratio has been... 

---