Mechanism of Solanesol Breakdown During Pyrolysis

Chemical composition of tobacco and tobacco smoke

“…Although the products listed in Table XII were obtained by alkaline fusion of the leaf pigments, the possibility that they are artifacts formed by degradation of nicotine is excluded since fusion of nicotine under identical conditions results in recovery of more than 95% of the alkaloid (142). The silicone present in the pigment is a minor moiety and is similar to the component in cigar smoke (491) postulated to be a polymeric methylsiloxane in the range of -[ (CH8) 2SiO jio-so-• This similarity was determined by infrared spectral comparisons and by the appearance of a major fragmentation peak at mje 207 polymeric siloxanes. The silicone is actually linked within SP and is not a contaminant from experimental manipulation since the isolation procedure involves several steps which would remove contaminating silicones: exhaustive extraction of SP with ether followed by dissolution of the ether-insoluble pigment in aqueous buffer and prolonged dialysis of the solution (143).…”

“…At 550°, an internal monoterpenoid unit may split in three ways. In route A, cyclization accompanied by scission of the remainder of the chain yields dipentene (D) directly (207). Cleavage between Ci and C2 is expected since this bond has the lowest dissociation energy of the carbon to carbon bonds in the diisoprenoid moiety (264).…”

Heat Transfer in Vacuum Pyrolysis of Decomposing Hazardous Plastic Wastes

“…It is important to pay close attention to the products of vacuum pyrolysis. Therefore, the parameters (final temperature, heating rate, and atmospheric pressure) of vacuum pyrolysis are optimized. − For obtaining purity product or removing pollutants, the relationships between particle characteristics (size, purity, and impurity percentage), catalytic agents, and the products are examined closely. − Meanwhile, pyrolysis mechanisms or pyrolysis routines of organics are also considered. − Beside the above information, there is another important area of vacuum pyrolysis to which to pay close attention. However, little information has been published about it.…”

Composition Studies on some Varieties of Tobacco and their Smoke: I. Major Components in Smoke Condensate

“…In flue-cured tobacco smoke, compounds which were pre-34 sent in higher concentrations than in the smoke from other varieties of tobacco were as follows: carbohydrate pyrolysates (1-hydroxy-2-propanone, 2-furfural, 5-methylfurfural, y-butyrolactone, furfuryl alcohol, cyclopentan-1,2-dione, 2-hydroxy-3-methyl-2-cyclopentenone, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one and 5-hydroxymethylfurfural) (14-17), a terpenoid breakdown product (limonene) (18) and others (acetic, propionic and butyric acid). 5-Hydroxymethylfurfural was present in especially high concentration.…”