4-methyl-pent-2-ene

Isolation and spectral analysis of the dimer K-crotonate (100 g) was heated at 320 °C for 4 h and subsequently treated as described above. The methyl esters (42 g), bp 100-135 °C at 6mmHg, were fractionally distilled to give three components dimethyl hex-l-ene-3,4-dicarboxylate 1, bp 97 °C at 8 mmHg dimethyl 4-methyl-pent-2-ene-3,5-dicarboxylate 2, bp 118°C at 5 mmHg dimethyl 2-metliylene-3-methylbutyl-l,4-dicarboxylate 3, bp 129 °C at 8 mmHg. 

The direct photolysis leads after ring opening to vinyldiazocompound 71 which decomposes via the carbene 72 to 73. Mechanistic studies demonstrated that the rather selective carbene 72 involved adds nonstereospecifically to cis- or trans-4-methyl-pent-2-ene and therefore from a triplet state 81>. The difference of the reaction path for the photolysis of 37f-pyrazoles 74 leading to 68d, e (R =H, m—Cl) or [1.2]-spirene 75 (R =p-Cl) may be attributed to intersystem crossing induced... 

Figure 12. Comparative XPS studies of PET surfaces after irradiation (10 min) in 1,5-hexadiene and perfluoro-4-methyl-pent-2-ene atmospheres (in both liquid and gaseous forms).

An MMA dimer obtained by CCT was hydrolyzed and then re-esterified with 1,10-decanediol. The resulting diester was allowed to react with chlorosulfonic acid to produce the methacrylate dimer surfactant, 2,4-bis(sodium 10-sulfate decanoxycarbonyl)-4-methyl-pent-l-ene. At the beginning of a polymerization, the molecule acts as a surfactant and subsequent incorporation of the dimer in the polymerization yields a surfactant-functionalized polymer. Thus, additional surfactants are not required. 

The anomalous low density of poly(4-methyl pent-l-ene) for a crystalline hydrocarbon polymer has been resolved in a new crystallographic analysis. The isotactic polymer crystallizes as a 2 helix with symmetry PAb and unit cell with dimensions a= 18.70 and c= 13.68 A. There are four chains with seven... 

C20H39F120P3Pt, Bis(triethylphosphine)- 1,1,1-trifluoro-5-methoxy-3- trifluoromethyl)-4-methyl-pent-3-ene-2-yl platinum hexafluorophos-phate, 45B, 864... 

CliHinAgP, Phenylethynyl(trimethylphosphine)silver(I), 3IB, 344 CliHi4CUP, Phenylethynyl(trimethylphosphine)copper(I), 31B, 345 CliHi5Cl20Ta, Dichloro(Tj -cyclopentadienyl)[(2-oxo-4-methyl-pent-3 ene)]tantalum, 46B, 868... 

UV spectra, S, 844 Pent-2-ene, perfluoro-2-methyl-2H-pyran synthesis from, 3, 740 Pent-2-enedioic acid, 2,4-diacetyl-esters... 

Catalysts such as HRuX(PPh3)3, where X is an optically active car-boxylate (e.g., / -mandelate) gave only 0.4% ee using 2-ethylhex-l-ene as substrate (124). Soluble Ziegler-Natta catalysts comprised of triiso-butylaluminum with the optically active alkoxide complex, titanium tetra-(-)-menthoxide, hydrogenated racemic terminal olefins such as 3,4-di-methyl pent- 1-ene, but with zero ee (323). 

Using an equimolar quantity of allyl methyl sulphide and ds-pent-2-ene resulted in incomplete reaction of the allyl sulphide and some self-metathesis of the sulphide substrate. When an excess (4 equiv) of but-2-ene was used, however, the desired but-2-enyl sulphide was formed in a good yield at ambient temperature. In this case, the large quantities of unwanted hydrocarbon starting material and self-metathesis products were gaseous alkenes and therefore easily removed. Using a large excess of one alkene to improve the yield of the desired cross-metathesis product in this way is obviously only viable if this alkene is inexpensive and both it and its self-metathesis product are easily removed. 

Azatricyclo[2.2.1.02 6]hept-7-yl perchlorate, 2368 f Azetidine, 1255 Benzvalene, 2289 Bicyclo[2.1.0]pent-2-ene, 1856 2-/ert-Butyl-3-phenyloxaziridine, 3406 3 -Chloro-1,3 -diphenyleyclopropene, 3679 l-Chloro-2,3-di(2-thienyl)cyclopropenium perchlorate, 3388 Cyanocyclopropane, 1463 f Cyclopropane, 1197 f Cyclopropyl methyl ether, 1608 2,3 5,6-Dibenzobicyclo[3.3.0]hexane, 3633 3,5 -Dibromo-7-bromomethy lene-7,7a-dihy dro-1,1 -dimethyl-1H-azirino[l,2-a]indole, 3474 2.2 -Di-tert-butyl-3.3 -bioxaziridinc, 3359 Dicyclopropyldiazomethane, 2824 l,4-Dihydrodicyclopropa[ >, g]naphthalene, 3452 iV-Dimethylethyl-3,3-dinitroazetidine, 2848 Dinitrogen pentaoxide, Strained ring heterocycles, 4748 f 1,2-Epoxybutane, 1609 f Ethyl cyclopropanecarboxylate, 2437 2,2 -(l,2-Ethylenebis)3-phenyloxaziridine, 3707 f Methylcyclopropane, 1581 f Methyl cyclopropanecarboxylate, 1917 f Oxetane, 1222... 

Infrared spectral studies have shown that cis- and tram-olefins are not isomerized by coordination to, or displacement from, platinum salts 127). ras-4-Methylpent-2-ene forms a more stable complex than do trans-4-methylpent-2-ene or cis-pent-2-ene it is suggested 132) that the electron-donating nature of the methyl group is responsible for the latter result by strengthening the v-component of the metal-olefin bond. 

Fig. 3.5. Relationship between log (retention time) and boiling point for a range of hydrocarbons on squalane at 43°C. A, aliphatics (and benzene) B, alicyclics, 1-4 = C5-Cg n-alkanes 5 = 2-methyl-butane 6 = 2-methylpentane 7 = 2,3-dimethylbutane 8-12 = C4-C8 1-olefins 13,15,17 = trans-(but-2-ene, pent-2-ene and hept-2-ene) 14,16,18 = e/s-(but-2-ene, pent-2-ene and hept-2-ene) 19 = 2-methylbut-l-ene 20 = 2-methylpent-l-ene 21 = 4-methylpent-l-ene 22 = 2-methylbut-2-ene 23 = cyclopentane 24 = cyclohexane 25 = methylcyclopentane 26 = methylcyclohexane 27 = cyclo-pentene 28 = cyclohexene 29 = 4-methylcyclohexane 30 = 1,3-butadiene 31, 32 = trans- and cis-1,3-pentadiene 33 = diallyl 34, 35 = trans- and c s-2-methyl-l,3-pentadiene 36 = cyclopentadiene ...

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