Trans-butylene carbonates

Trans-2,3-butylene carbonate has a structure similar to that of PC. However, its cointercalation into the graphite negative electrode is suppressed because of its symmetry, since the presence of two frans-orientated CPl3 groups increases its overall bulk. As a result, the cycling efficiency and the low-temperature performance of graphite with this solvent are good. The ds-2,3-butylene... 

FIGURE 7.62 The influence of the proton on the dependence of the force originating in the deformation of the C=C bond on the distance between the carbon atoms (-) ethylene molecule and C2H5+ cation in symmetric and asymmetric forms (R=H) (—) molecule of trans-butylene-2 and the symmetric cation 4119" (R=CH3). 

Butylenes are four-carbon monoolefins that are produced by various hydrocarbon processes, principally catalytic cracking at refineries and steam cracking at olefins plants. These processes yield isomeric mixtures of 1-butene, cis- and trans butene-2, and isobutylene. Derivatives of butylenes range from polygas chemicals and methyl t-butyl ether, where crude butylenes streams may be used, to polybutene-1 and LLDPE, which require high-purity 1-butene. In 1989, the estimated consumption of butylenes (in billions of pounds) was alkylation, 29.0 MTBE, 4.7 ... 

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