2-Ethyl-3-methyl-l-butene

Write the structural formulas of the following compounds (a) 1-butyne (b) 2-methylpropene (c) 2-ethyl-3-methyl-l-butene (d) 3-methyl-1-butyne. 

Methyl-4-hexenal13 In einem DruckgcfaB werden 86 g (1 mol) 3-Hydroxy-3-methyl-l-buten zusammen mit 0,5g Phosphorsaure und 150g Vinyl-ethyl-ether unter 6 bar Stickstoff 2 Stdn. auf 150° erhitzt. Danach wird bei 20° mit 2 ml Triethylamin neutralisiert und dcstilliert Ausbeute 91g (81°/o) Sdp. 907100 Torr (13,33 kPa). 

Methyl-4-hexenal138 86 g (1,00 mol) 3-Hydroxy-3-methyl-l-buten und 150 g (2,10 mol) Ethyl-vinyl-ether werden zusammen mit 0,5 g (0,5 mol-%) Phosphorsaure im 400-m/-Druckgefa8 unter 6 atm. (600 kPa) Stick-stoff 2 Stdn. auf 150° erwarmt. Dann wird auf 20° gekiihlt und das Gemisch mit 2 ml Triethylamin neutralisiert. 

Similar unsatisfactory results, usually with even lower inductions are obtained with other terminal aliphatic alkenes such as 1-pentene, 2-methy]-l -butene, 3-methyl-l -butene, 2,3-dimethyl-l-butene, 3,3-dimethyl-l-butene, 2,3,3-trimethyl-l-butene, 2-ethyl-l-hexene, I-hex-ene and 1-octene (Table 1). 

The a-nucleated polypropylene is used for power cable insulatioa A polymeric a-nucle-ating agent comprises monomer units derived from a vinyl compound. The vinyl compound is selected from the group consisting of vinyl cyclohexane, vinyl cyclopentane, vinyl 2-methyl cyclohexane and vinyl noibomene, 3-methyl-l-pentene, styrene, p-methyl-styrene, 4-methyl-1-pentene, 3 -methyl-l-butene, and 3-ethyl-l-hexene. Nucleating agent is present in the polymer composition in the amount of 0.0001 to 0.2 wt%. ... 

Ti(OR)4-R3Al- additives 1-butene, 2-ethyl-l-butene, 3-methyl-l-butene 320... 

NaHCOg and a trace of 2,6 di tert-butyl-p-cresol as radical inhibitor added to a soln. of isoprene in chloroform, the stirred, ice-cooled suspension treated drop-wise under Ng with 82%-peroxyacetic acid during 6 hrs., stirring continued 24 hrs., filtered, the resulting soln. of crude 3,4-epoxy-3-methyl-l-butene (Y 80%) treated with ethyl acetate followed by CuCl2 2H20 and LiCl, and refluxed ca. 15 min. at 90° (E)-4-chloro-2-methylcrotonaldehyde (Y 78-80%). G.Eletti-Bianchi, F. Centini, and L. Re, J. Org. Chem. 41, 1648 (1976). 

Tacticity studies have been conducted on poly(3-methyl-l-butene) [120], poly(p-isopropyl-a-methyl styrene) [121], a-methyl styrene [122], polytetrafluoroethylene [123], polyacrylic acid [124], polymethylvinyl ethers [125], polyacrylonitrile [126, 127], polyvinyltrifluoro acetate [128], polyvinyl alcohol and its ethers [129, 130], isobutene-maleic anhydride [111], isobutene dimethyl fumerate [131], isobutene dimethyl maleate [131], polyacrylonitrile [127], ethylene - vinyl acetate [132-135], polyalkyl vinyl ethers [136, 137], ethyl-2-chloroacetate [133], poly-trans-1,3-pentadiene [138], isotactic-l-butene - propylene [139], butadiene - propylene [140], polybutene [141], polychloroprene [142], ethylene - vinyl chloride [143], chlorinated polyethylene [144, 145], poly-a-methyl styrene [146], styrene acrylic acid [147], a-methyl styrene - methacylonitrile [148], styrene acrylonitrile [149], styrene isobutene [150], poly(p-fluoro-a-methyl styrene) [151], polyarylamide-6 [152], PP - polyamide-6 [152], polystyrene oxide [153], polybutene [154], atraconic anhydride - p-chlorostyrene [155], styrene - maleic anhydride [156, 157], ethylene - vinyl acetate [158], polymethyl vinyl ether [159], propene - carbon monoxide [160], methyl(3,3,3-trifluoropropyl)siloxane [161], poly(diallyldimethyl ammonium chloride) [162], polypropene [163, 164], polyepichlorohydrin [165], maleic anhydride-p-chlorostyrene [166], polymethacrylonitrile [167] and polyvinyl acetate [168]. 

Methyl Isopropyl Ketone. Methyl isopropyl ketone [563-80-4] (3-methyl-2-butanone) is a colorless Hquid with a characteristic odor of lower ketones. It can be produced by hydrating isoprene over an acidic catalyst at 200—300°C (150,151) or by acid-catalyzed condensation of methyl ethyl ketone and formaldehyde to 2-methyl-l-buten-3-one, foUowed by hydrogenation to the product (152). Other patented preparations are known (155,156). Methyl isopropyl ketone is used as an intermediate in the production of pharmaceuticals and fragrances (see Perfumes), and as a solvent (157). It is domestically available from Eastman (Longview, Texas) (47). 

Polarization is found in reactions involving chlorides. 1,1-Dichloro-2,2-dimethylcyclopropane (26) reacts with lithium ethyl in benzene-ether solution (40°) giving mainly l-chloro-2,2-dimethylcyclopropane (27 X = H) and 3-methyl-l,2-butadiene (28) both of which are polarized (Ward et al., 1968). If n- or t-butyl lithium are used in the reaction, the butene produced by disproportionation shows only net polarization. 

DIMETHYL-l-BUTENE 2-ETHYL-1-BUTENE trans-3-METHYL-2-PENTENE... 

The enthalpy of formation of the 2-ethylbutadiene is taken from Reference 8. The enthalpy of formation of the monoolefin products, 3-methyl-l-pentene and 2-ethyl-l-butene, are derived from Reference 11. 

Side reactions can be avoided with the use of 2-ethyl-3,3-dimethoxy-l-butene instead of 2-methoxy-3-methyl-1.3-hutadiene28. 

Geometrical trans to cis isomerization of 3,3 -, 4,4 -, and 5,5 -disubstituted 2,2 -diphenoquinones has been studied by computational methods.The double bond isomerization of butene-catalysed l-ethyl-3-methyl-imidazolium chloride ionic liquid has been similarly examined and stepwise isomerization is suggested.The reaction of l,2-di(l-adamantyl)-2-thioxoethanone with diazomethane and 2-diazopropane gave 2-acylthiiranes via 2 - - 3-cycloaddition, elimination of nitrogen, and 1,3-dipolar electrocyclization of the intermediate acyl-substituted thiocarbonyl ylides. Rearrangement of pyrimidine-5-carboxylic acids esters to 5-acylpyrimidones does not occur in the examples studied and a [l,4]-phospho-Fries rearrangement has been reported. ... 

Figure 5. Correlation of rate of hydration of terminal alkenes with

Methyl-l, 2-butadiene Ethyl acrylate Cyclopentane d-Methyl-l-butene 2-Methyl-2-butene 2-Methyl-2-butene AUyl ethyl ether 8-Methyl-2-butanone 2-Pentanone... 

Chinchona alkaloids, such as quinine, are readily available quinuclidine chiral bases which have been used extensively in catalytic Michael additions239 243. Methy 1-2,3-dihydro-1-oxo-l/f-in-dene-2-carboxylate (1) is most frequently used as the Michael donor in these studies. Enantiose-lectivities as high as 76% are reached in the additions to 3-buten-2-one. Modest enantioselec-tivities (< 67%) were also obtained with ethyl 2-oxo-l-cyclohexanecarboxylate and methyl l,3-dihydto-3-oxo-l-isobcnzol urancarboxylate244 245. 

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