Dimethyl-cyclo-octadiene

Abbreviations arene, i/6-benzene or substituted benzene derivative bipy, 2,2 -bipyridyl Bu, Bu", Bu, iso-, n-, or rerf-butyl COD, 1,5-cyclo-octadiene Cp, /5-C5H5 DAD, dimethyl-acetylene dicarboxylate dam, 1,2-bis(diphenylarsino)methane DBA, dibenzylideneacetone DMF, A. A -dimethylformamide dpe, l,2-bis(diphenylphosphino)ethane dpen, os-l,2-bis(di-phenylphosphino)ethylene dpm, 1,2-bis(diphenylphosphino)methane ESR, electron spin resonance F6-acac, hexafluoroacetylacetone FN, fumaronitrile MA, maleic anhydride Me, methyl MLCT, metal ligand charge transfer phen, 1,10-phenanthroline Pr , Pr", iso- or n-propyl py, pyridine RT, room temperature TCNE, tetracyanoethylene tetraphos, (Ph2PCH2CH2)jP THF, tctrahydrofuran Xylyl, 2,6-Me2C6H3. 

BrHgOvRu3C]4H, Ruthenium, (bromomer-cury)nonacarbonyl(3,3-dimethyl-1 -bu-tynyl)-rr/angu/o-tri-, 26 332 BrN04SC iiHi8, Bicyclo[2.2.1]heptane-7-methanesulfonate, 3-bromo-l,7-dimethyl-2-oxo-, [(l/ )-( iVDO, ANTI)]-, ammonium, 26 24 BrSiC3H, Silane, bromotrimethyl, 26 4 Br..N RuC, H,j, Ruthenium(ll), bis-(benzonitrile)dibromo(Ti -1,5-cyclo-octadiene)-, 26 71... 

Nickel. Product analysis gives some information on the catalytic role of Ni(CN)2L2 , where L = CN, phen, etc., in the hydrogenation and isomerisation of dimethyl maleate and of 1,5-cyclo-octadiene. ... 

A solution of 4-bromobenzaldehyde (106, 1.85 g, 10 mmol) in dry A, A -dimethyl formamide (10 ml) was added dropwise to a suspension of bis(l,5-cyclo octadiene)nickel(O) (Ni(COD)2, 1.53 g, 5.6 mmol) in A,/V-dimethylformamide (10 ml) under nitrogen at 25 °C. The reaction mixture was stirred at 35 C for 20 h, then partitioned between 3% aqueous hydrochloric acid (20 ml) and dichloromethane (20 ml). After being filtered to remove a finely divided nickel, the organic layer was washed with water, dried (Na2S04), and concentrated to dryness. The residue was purified with diethyl ether (2-3 ml) to obtain 0.83 g (79%) of pure 4,4 -diformyl biphenyl (105) as colourless crystals. 

Bis(trifluoromethyl)platinum complexes may conveniently be prepared by the reaction of dimethyl(cyclo-octa-l,5-diene)platinum with trifluoro-iodomethane in methylene chloride, followed by displacement of the cydo-octadiene with the required ligand L (L = AsMcs, PMeaPh, pyridine, RNC, etc.) Oxidative addition of iodine thence gives the platinum(iv) compounds ... 

Ac = Acetyl acac = Acetylacetonate bda = Benzylidene-acetone BINOL = l,E-bi-2-naphthol Bn = Benzyl brsm = Yield based on recovered starting material Bu = Butyl CAN = Ceric ammonium nitrate CBS = Corey/Bakshi/Shibata catalyst [(+) or (—)-(S)-2-methyl-oxazaborolidine] COD = Cyclo-l,5-octadiene COT = Cyclooctatetraene Cp = Cydopentadienyl Cp = Penta-methylcydopentadienyl Cy = Cydohexyl DCC = Dicy-dohexylcarbodiimde DMF = N,N-dimethylformamide DMPU = l,3-dimethyl-3,4,5,6-tetrahydro-2(lH)-pyrimidin-one DMSO = Dimethylsulfoxide dppe = Diphenylphosp-hinoethane dr = Diastereomer ratio dppm = Diphenylphos-phinomethane E = Electrophile ee = Enantiomeric excess EHMO = Extended hiickel molecular orbital Et =... 

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