citrenen.
/ˈsɪtriːn/, U.S. /ˈsɪtrin/ Chemistry. Now rare.
A monocyclic hydrocarbon of the terpene series which is the d-isomer of limonene (hence more usually called d-limonene) and is an orange-scented liquid present in the essential oils of lemon, orange, bergamot, neroli, etc. Also (now historical): any member of the class of monocyclic terpenes.Systematic name: 1-methyl-4-(1-methylethenyl)-cyclohexene; C10H16.
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the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > terpenes > others
citrene1834
citronyl1836
camphene1839
terebenthene1857
terebilene1857
thymene1857
sylvestrene1877
cinene1884
pinene1885
fenchene1891
phellandrene1893
camphane1895
humulene1895
myrcene1895
sabinene1900
limonene1901
terpinene1902
terpinolene1902
fenchane1907
1834 E. Turner Elem. Chem. (ed. 5) ii. 405 Citrene..is so called from being the essential and almost sole ingredient of the volatile oil of lemons.
1880 H. E. Armstrong & C. E. Groves Miller's Elements Chem. (ed. 5) III. x. 988 (note) Excepting perhaps sylvestrene, all the hydrocarbons of the formula C10H16 derived from the various essential oils, &c., appear to belong to one or other of two classes: those boiling at about 156° (312°.8 F.), which are conveniently termed terpenes, and those boiling at about 178° (352°.4 F.), which may be distinguished as citrenes.
1912 W. Tibbles Foods ii. 63 Terpenes..are not identical substances, but isomers called terpene, camphene, and citrene.
1949 J. Simonsen Terpenes (ed. 2) II. iii. 107 Tilden..suggested that the terpenes could be divided into three main classes: (i) the turpentines, b.p. 155-165°, (ii) the citrenes, b.p,. 170-180°, and (iii) sylvestrene.
1998 Internat. Patent 9,817,366 26 Citrene comprises at least about twelve and one half..percent by volume of said liquefaction agent.
This entry has been updated (OED Third Edition, June 2014; most recently modified version published online March 2022).
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