Pinenes


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Pinenes

 

bicyclic terpenes, C10H16; colorless liquids with the odor of pine cones. Freely soluble in nonpolar organic solvents, insoluble in water, and readily oxidizable upon exposure to air, especially in light. Of the three known α-, β-, and δ-isomers, only α-pinene and β-pinene, or nopinene, are widespread in nature (respective boiling points, 155.9° and 166°C; densities, 0.858 and 0.871 g/cm3 at 20°C). Both α- and β-pinenes occur in various turpentines, from which they are extracted by rectification, and in many essential oils.

Pinenes are extremely reactive. Upon heating to temperatures above 300°C, α -pinene isomerizes to allo-ocimene, and β-pinene to myrcene; pinenes polymerize readily under the action of acids. Pinenes are used as solvents for varnishes and paints and as raw material in the manufacture of camphor, terpineol, terpin hydrate, insecticides, and odoriferous substances.

References in periodicals archive ?
Changes in pinene emissions with press conditions were similar to the changes seen in HMwVOC emissions.
HMwVOC and pinene hot-pressing emissions as a function of adhesive type
Figure 5 shows the relative effects of press variables on the pinene emissions.
Twenty-two chemical compounds were included in this classification, with the main compounds being hexanal, pinenes, 2-pentyl-furan, 2-octenal, nonanal, 2-methyl-naphthalene, and longer chain alkanes ([C.
It was generally found that panels pressed at a hi gh temperature for shorter press times emitted more formaldehyde, pinenes, and higher molecular weight VOCs (defined as VOCs with boiling points higher than 40[degrees]C).
While formaldehyde emissions were nearly identical for the two conditions, the HMwVOC and pinenes were higher at the higher temperature/lower press time condition.