By Zvi Rappoport
This quantity makes a speciality of the chemistry of dienes and polyenes, that are a really vital crew of chemical compounds within the research of other varieties of syntheses in line with the Diels-Adler reactions that permits for stereospecific molecules to be ready. Dienes and polyenes are present in a great number of traditional and human-made items, together with such common items as terpenes, ldl cholesterol, nutrition A, and plenty of crucial oils, in addition to many polymers and rubber items. This quantity is now to be had in digital layout from Books on-line.
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Extra resources for The Chemistry of Dienes and Polyenes,
Sample text
The gas-phase reaction between c-C4 H4 Cž ions and acetylene has also been measured188 . Butadiene Radical Cations. Cycloaddition reactions between the radical cations of 1,3-butadiene and its derivatives with various neutral olefins have been a subject of intense research over the past decades because of the fundamental importance of this type of pericyclic reactions in organic chemistry. Reviews concerning Diels –Alder reactions involving radical cationic species in the gas phase and in general organic chemistry are mentioned here4,90c,189 .
Cis,cis,cis-, cis,cis,trans- and trans,cis,trans-2,4,6-octatriene, also exhibit very similar EI mass spectra, as demonstrated by Rennekamp and Hoffman126 . Loss of CH3 ž is the most prominent fragmentation in all cases, with a slight preference for the cyclic isomers, in which a direct exit path exists by dissociation of the allylic C C bonds. Furthermore, CH3 ž loss and the other fragmentation channels (expulsion of Hž , H2 and the ensemble of both) were found to be associated with identical kinetic energy release (Tkin ) values.
Again, the reader is also referred to Section III describing the unimolecular gas-phase ion chemistry of dienes. The reactions of neutral allene and other unsaturated hydrocarbons with carbon ions (CCž ) have been studied by Bohme and coworkers200 using the flowing afterglow (selected ion flow tube, SIFT) technique, in order to gain insight into the fundamentals of the buildup mechanisms of carbon skeletons. Parent201 reacted CCž , SiCž and Si2 C2 Cž with allene and propyne in an FT-ICR mass spectrometer and found distinct reactivity towards inserˇ tion into single bonds.