Showing papers on "Terpene published in 1976"

Analyses of Monoterpenes of Conifers by Gas-Liquid Chromatography

Abstract: Monoterpenes are C10 chemical compounds with carbon skeletons consisting of two isopentane (isoprene) units joined together and are a major component of the steam-volatile part of oleoresin produced in tissues of most conifers. Most of them are monoterpene hydro-carbons (C10H16). But often the volatiles in oleoresin include oxygenated monoterpenes, sesquiterpenes, and n-hydrocarbons and are often studied along with the monoterpene hydrocarbons. In the literature, these chemical are variously termed “monoterpenes”, “terpenes”, “volatile oils”, “essential oils” or “turpentine”. For the chemistry of these compounds see Simonsen and Owen (1953, 1957) and de Mayo (1959).

Chemosystematic studies in the genus Abies. II. Leaf oil analysis of grand fir

Abstract: The volatile leaf oil of the grand fir consists mainly of (−)-α-pinene, (−)-camphene, (−)-β-pinene, (−)-β-phellandrene, (−)-bornyl acetate, cadinene and muurolene isomers, and two cubebol isomers. Santene, tricyclene, myrcene, car-3-ene, limonene, terpinolene, p-cymene, camphenolene aldehyde, camphor, borneol, terpinen-4-ol, α-terpineol, citronellyl and geranyl acetate, α-cubebene, α-copaene, calamenene, and two farnesol isomers were also isolated. Attempts to identify these terpenes with a combined gas chromatograph – mass spectrometer failed to give unequivocal data and identities had to be confirmed by isolation and recording of other spectra. Except for β-pinene and β-phellandrene, within-tree and tree-to-tree variation of terpene percentages was relatively small. The leaf oil terpene composition appears to be well suited to determine geographical variation. Only minor differences were recorded between some northern coastal and interior populations, but samples from south-central Oregon showed major d...

Application of the blind assay to biological activity and tobacco smoke terpenes

Abstract: The blind assay technique was applied to the chromatographic data generated from gas-liquid chromatography (GLC) profiles of terpene-enriched fractions from the total particulate matter (TPM) of eight experimental cigarettes Correlation of the entire terpene fraction peak area and 16 individual peaks with data from three skin-painting bioassay parameters indicated that the terpene fraction as a whole and at least 12 of its constituents correlate well with biological activity Six correlating peaks were tentatively identified as d-limonene, damascenone, norphytene, neophytadiene, phytol, and squalene High correlations were also observed between the TPM concentrations of these constituents and the total terpene fraction Of the terpenes visualized, d-limonene would act as the best indicator of the tobacco smoke biological activity

Resinous terpene maleimide and process for preparing the same

Abstract: There are provided resinous terepene maleimides useful as tackifiers for elastomers and prepared by reacting at tempertures between 140° C. and 200° C. substantially equimolar amounts of (a) non-conjugated monocyclic terpenes or mixtures thereof and (b) maleic acid anhydride in the presence of from 0.05% to 0.15% iodine, based on the weight of the terpene, recovering a mixture of not less than 95% mono-adduct and not more than 15% di-adduct of terpene maleic adduct, further reacting said adduct mixture with stoichiometric amounts of an aliphatic polyamine, and recovering terpene maleimide having a number average molecular weight between about 500 and about 600.

Preparation of 22or non substituted terpene carboxylic esters ortheir esters

Abstract: PURPOSE:Preparation of the compound of formula 2 by hydrolyzing or alcoholyzing the compound of formula 1 under acidic conditions.