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Trans isomers of 2-butene

Figure 6.3 Cis and trans isomers of 2-butene. The cis isomer has the two methyl groups on the same side of the double bond, and the trans isomer has the methyl groups on opposite sides. Figure 6.3 Cis and trans isomers of 2-butene. The cis isomer has the two methyl groups on the same side of the double bond, and the trans isomer has the methyl groups on opposite sides.
In addition to the alkene isomers that exist because of double-bond position, alkene isomers can also exist because of double-bond geometry. For instance, there are two geometrical, or cis-trans isomers, of 2-butene, which differ in their geometry about the double bond. The cis isomer has its two -CH3 groups on the same side of the double bond, and the trans isomer has its two -CH3 groups on opposite sides. Like other kinds of isomers we ve discussed, the individual cis and trans isomers of an alkene are different substances with different physical properties and different (although often similar) chemical behavior. cfs-2-Butene boils at 4°C, for example, but trans-2-butene boils at 0.9°C. [Pg.1002]

The cis and trans isomers of 2-butene are a specific example of a general type of stereoisomer occurring at carbon-carbon double bonds. Whenever the two groups on each end of a carbon-carbon double bond are different from each other, two diastereomers are possible. [Pg.285]

Trans 2-butene is oligomerized preferentially at -50°C. As seen here, (C/T), is higher for LaHY than for MSA. Karger and Michel have shown that the trans isomer (of 2-butene) jumps more frequently between the supercages of NaX than the cis isomer [10]. This is anticipated... [Pg.571]

The cis and trans isomers of 2-butene give different cyclopropane products in the Simmons-Smith reaction. Show the structure of each, and explain the difference. [Pg.253]

In principle, c/5-2-butene and ra/2 -2-butene may be interconverted by rotation about the C-2—C-3 double bond. However, unlike rotation about single bonds, which is quite fast, rotation about double bonds is restricted. Interconversion of the cis and trans isomers of 2-butene has an activation energy which is 10-15 times greater than that for rotation about the single bond of an alkane and does not occur under normal circumstances. [Pg.190]

If two methyl groups replace two hydrogen atoms, one on each carbon atom of ethene (H2C = GH2), the result is 2-butene (GH3GH = GHGH3). Experimental evidence confirms the existence of two compounds with the same set of bonds. The difference in the two compounds is in the location in space of the two methyl groups the ds isomer has two methyl groups on the same side in the plane of the double bond and the trans isomer has two methyl groups on opposite sides of the double bond. The physical properties of the ds and trans isomers of 2-butene are quite different. [Pg.273]

Figure 3-13 compares the cis-trans isomers of 2-butene with those of 1,2-dimethylcyclopentane. Make models of these compounds to convince yourself that cis- and rmn5-l,2-dimethylcyclopentane cannot interconvert by simple rotations about the bonds. [Pg.103]

An achiral molecule will always have a diastereomer. (6.2) The CIS and trans isomers of 2-butene are chiral. (6.1)... [Pg.190]

Heats of hydrogenation depend on the degree of substitution of the carbon-carbon double bond the greater the substitution, the lower the heat of hydrogenation. Compare, for example, heats of hydrogenation of ethylene (no substituents), propene (one substituent), 1-butene (one substituent), and the cis and trans isomers of 2-butene (two substituents). [Pg.287]


See other pages where Trans isomers of 2-butene is mentioned: [Pg.158]    [Pg.285]    [Pg.180]    [Pg.994]   
See also in sourсe #XX -- [ Pg.282 , Pg.282 ]




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Butene isomers

Of 1-butene

Of trans

Trans isomers

Trans-2-butene

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