Cyclooctene 1-methyl

Abbreviations acac, acetylacetonate Aik, alkyl AN, acetonitrile bpy, 2,2 -bipyridine Bu, butyl cod, 1,5- or 1,4-cyclooctadiene coe, cyclooctene cot, cyclooctatetraene Cp, cyclopentadienyl Cp, pentamethylcyclopenladienyl Cy, cyclohexyl dme, 1,2-dimethoxyethane dpe, bis(diphenyl-phosphino)ethane dppen, cis-l,2-bis(di[Atenylphosphino)ethylene dppm, bis(diphenylphosphino) methane dppp, l,3-bis(diphenylphosphino)propane eda,ethylenediamine Et,ethyl Hal,halide Hpz, pyrazole HPz, variously substituted pyrazoles Hpz, 3,5-dimethylpyrazole Me, methyl Mes, mesityl nbd, notboma-2,5-diene OBor, (lS)-endo-(-)-bomoxy Ph, phenyl phen, LlO-phenanthroline Pr, f opyl py, pyridine pz, pyrazolate Pz, variously substituted pyrazolates pz, 3,5-dimethylpyrazolate solv, solvent tfb, tetrafluorobenzo(5,6]bicyclo(2.2.2]octa-2,5,7-triene (tetrafluorobenzobanelene) THE, tetrahydrofuran tht, tetrahydrothicphene Tol, tolyl. 

Abbreviations aapy, 2-acetamidopyridine Aik, alkyl AN, acetoniuile Ar, aryl Bu, butyl cod, 1,5-cyclooctadiene COE, cyclooctene COT, cyclooctatetraene Cp, cyclopentadienyl Cp , penta-methylcyclopentadienyl Cy, cyclohexyl DME, 1,2-dimethoxyethane DME, dimethylformamide DMSO, dimethyl sulfoxide dmpe, dimethylphosphinoethane dppe, diphenylphosphinoethane dppm, diphenylphosphinomethane dppp, diphenylphosphinopropane Et, ethyl Ec, feirocenyl ind, inda-zolyl Me, methyl Mes, mesitylene nb, norbomene orbicyclo[2.2.1]heptene nbd, 2,5-norbomadiene OTf, uiflate Ph, phenyl PPN, bis(triphenylphosphoranylidene)ammonium Pi , propyl py, pyridine pz, pyrazolate pz, substituted pyi azolate pz , 3,5-dimethylpyrazolate quin, quinolin-8-olate solv, solvent tfb, teti afluorobenzobaiTelene THE, tetrahydrofuran THT, tetrahydrothiophene tmeda, teti amethylethylenediamine Tol, tolyl Tp, HB(C3H3N2)3 Tp , HB(3,5-Me2C3HN2)3 Tp, substituted hydrotiis(pyrazol-l-yl)borate Ts, tosyl tz, 1,2,4-triazolate Vin, vinyl. 

Steric factors may also be important in situations where alternative modes of reaction are available. Dall Asta (44) examined the ring-opening polymerization of 3-methyl-m-cyclooctene. By infrared analysis of the product formed, he obtained quantitative information about the occurrence of head-to-head and head-to-tail successions. More than 90% of the links in the polymethyloctenamer were of the head-to-tail type, but the sterically more hindered and, therefore, unfavored head-to-head links were also observed (about 5%). Ofstead (39) investigated the ring-opening polymerization of some 1,5-cyclooctadienes substituted at one of the two... 

Auf analoge Weise erhalt man galvanostatisch (200 mA) aus 5-Oxo-cycloocten 1-Hydroxy-bicyclo[3.3.0 pctan (69% d. Th.) bzw. aus 2-[Buten-(3)-yl]-cyclohexanon 1-Hydroxy-9-methyl-bicyclo[4.3,0]nonan (67% d. Th.)2 ... 

Both o- and p- substituted bis(methylthio)arylmethylium salts, derived by the 5-methylation of substituted dithiobenzoates, dimerise following deprotonation to give 1,4-dithianes. Only with the former isomer is the quinone methide generated leading to a cyclooctene derivative <96LA1159>. 

Especially reactive carbonyl compounds such as methyl pyruvate can trap the carbonyl oxide component. For example, ozonolysis of cyclooctene in the presence of methyl pyruvate leads to 5 when treated with triethylamine 5 is converted to 6, in which the two carbons of the original double bond have been converted to different functionalities.205... 

The location of hydrogen atoms by electron diffraction suffers from some uncertainty, and in order to confirm the state of hybridization of the olefinic carbons, Traetteberg et al. (177) undertook a combined electron diffraction and strain energy calculation study of 1-methyl-frans-cyclooctene. Calculations, us-... 

Emrick and Coughlin et al. reported on the synthesis of cadmium selenide-polymer composites. A vinylbenzyl-derivatized phosphine oxide was ph-ysisorbed onto cadmium selenide particles. Subsequent reaction with RUCI2 (PCy3)2(CHPh) or RuCl2(NHC)(PCy3)(CHPh) (NHC= 1,3-dimesityhmidazol-2-ylidene) followed by addition of cyclooctene, 7-oxanorborn-5-ene-2,3-dicarboxylic anhydride, dicyclopentadiene or N-methyl-7-oxanorborn-5-... 

Recycling experiments with MnClj2TMPS immobilized on methylated PVP, Recycling experiments were performed by re-using four times the same MnQi2TMPS catalyst supported on methylated PVP in the PhIO epoxidation of cyclooctene. For [MnCli2TMPS-PVPMe ][TsO"], it should be noted that the first two cycles are exactly the same, only a small activity decrease is observed for the third run. With 1 jimol of MnCli2TMPS immobilized on [PVPMe "][TsO ] the total epoxide production after 4 runs is 1970 jimol. The overall selectivity based on PhIO is 65%. ... 

Figure 1. PhIO oxidation of cyclooctene catalyzed by various sulfonated manganese porphyrin immobilized on methylated PVP, [Mn-porphyrin-S-PVPMe+][TsO-]. [MnTMPS-PVPMe+][TsO-] (O), [MnBrgTMPS-PVPMe+][TsO-] ( ), [MnTDCPPS-PVPMe+][TsO-] (1) and [MnCli2TMPS-PVPMe ][TsO ] (O). Conditions cyclooctene (150 imol), PhIO (750 jimol), Mn-porphyrin-S (2 jimol) immobilized on [PVPMe+][TsO-] (200 mg of PVP treated by TsOMe) in 3 mL of dichloromethane at room temperature. (Reproduced from ref. 12a. Copyright 1992 American Chemical Society.)...

The intermediate cyclooctene complex appears to be more reactive with respect to CS coordination and more sensitive to oxidation when the arene ring bears electron-withdrawing groups (e.g., C02CH3). Dicarbonyl(methyl rj6-benzoate)-thiocarbonyl)chromium is air stable in the solid state and reasonably stable in solution.9 The infrared spectrum exhibits metal carbonyl absorptions at 1980 and 1935 cm"1 and a metal thiocarbonyl stretch at 1215 cm"1 (Nujol) (these occur at 1978, 1932, and 1912 cm"1 in CH2C12 solution).10 Irradiation of the compound in the presence of phosphite or phosphine leads to slow substitution of CO by these ligands, whereas the CS ligand remains inert to substitution. The crystal structure has been published."... 

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