| As the chromophore is a polyene, there are several double bonds capable of isomerization. |
|
| Thus, a volume-conserving model seems to be needed for the isomerization of stilbene dendrimers with these large molecular weights. |
|
| The bond selectivity and unidirectionality of the isomerization in bR are in striking contrast with those of the isolated chromophore. |
|
| In general, the isomerization occurs somewhat slower and exhibits a more disperse temporal behavior than for azobenzene. |
|
| In addition, the isomerization of olefins with small molecular weight in glassy solvent at 77 K have been proposed to proceed by H-T mechanism. |
|
| For the pathway of cis-trans isomerization of olefins, we suggest distinguishing conjugated olefins of little polarity from other cases. |
|
| Finally, the stereochemistry of stable cyclization products following the isomerization might provide experimental proof as discussed in the following section. |
|
| The majority of quantitative reports have involved azobenzene, styryl or thioindigo structures, which undergo a cis-trans isomerization when photolyzed. |
|
| Because the interconversion of the two tautomers is slower than the actual proton transfer reaction, a conformational change is probably associated with the isomerization. |
|
| Most of those who died were in trailers next to the isomerization unit, which boosts octane in gasoline, when it blew up. |
|
| Process of conversion consisting of the reactions of cracking, cyclization, dehydrogenation and isomerization. |
|
| Examples are the linkage isomerization and cis-trans isomerization reactions depicted below. |
|
| All operations were carried out on ice under a dim green safe light to prevent photodegradation, isomerization and structural changes of the pigments. |
|
| In nonpolar polyenes the lowest-lying funnel corresponds to a 3 kink with both double and adjacent single bonds twisted, which may initiate hula-twist isomerization. |
|
| However, recent measurements have found alpha-HCH levels are dropping over time in the Southern Hemisphere as well as in the Arctic Ocean, which is not consistent with the isomerization theory and a continued use of lindane. |
|
| However, there are also tautomers, where isomerization occurs spontaneously, such that a pure substance cannot be isolated into its tautomers. |
|
| One member expressed regret, however, that the alpha and beta isomers were not being considered concurrently, because they were closely linked to lindane both in production and through isomerization in the environment. |
|
| As amber matures over the years, more polymerization takes place as well as isomerization reactions, crosslinking and cyclization. |
|
| The polymerized intermediate products can further undergo cracking, isomerization, cyclization, aromatization and condensation reactions. |
|
| However, these studies have demonstrated isomerization in condensed media, but there is no evidence that isomerization takes place in the gas phase under ambient atmospheric conditions. |
|
|
|
| Among these reactions and classes are isomerization, addition and elimination, nitrogen and sulfur tranferases, oxidoreductases, and complex enzymes. |
|
