Title: b-Farnesene
CAS Registry Number: 18794-84-8
CAS Name: 7,11-Dimethyl-3-methylene-1,6,10-dodecatriene
Molecular Formula: C15H24
Molecular Weight: 204.35
Percent Composition: C 88.16%, H 11.84%
Literature References: The naturally occurring
trans form or
(E)-isomer is a constituent of various essential oils,
see F. Sorm
et al., Collect. Czech. Chem. Commun. 14, 699 (1949);
15, 626 (1951); also an alarm pheromone of several aphid species: Bowers
et al., Science 177, 1121 (1972); Edwards
et al., Nature 241, 126 (1973); W. S. Bowers
et al., J. Insect Physiol. 23, 697 (1977). Isoln from leaves of wild potato,
Solanum berthaultii Hawkes,
Solanaceae: R. W. Gibson, J. A. Pickett,
Nature 302, 608 (1983). Prepd by dehydration of farnesol: Bhati,
Perfum. Essent. Oil Rec. 54, 376 (1963); Brieger,
J. Org. Chem. 32, 3720 (1967); alternate syntheses: Tanaka
et al., J. Am. Chem. Soc. 97, 3252 (1975); S. Akutagawa
et al., Chem. Lett. 1976, 485; O. P. Vig
et al., Indian J. Chem. Sect. B 18, 33 (1979). Synthesis of
(Z)-isomer: Anet,
Aust. J. Chem. 23, 2101 (1970); O. P. Vig
et al., J. Indian Chem. Soc. 47, 999 (1970);
eidem, Indian J. Chem. 13, 1244 (1975).
Derivative Type: (E)-Form
Properties: Oil, bp 124°. d420 0.8310.
nD20 1.4870. uv max (hexane): 224 nm (e 14000).
Boiling point: bp 124°
Index of refraction: nD20 1.4870
Absorption maximum: uv max (hexane): 224 nm (e 14000)
Density: d420 0.8310
Derivative Type: (Z)-Form
Properties: Oil, bp3-4 95-107°.
nD32 1.4780. uv max (hexane): 224 nm (e 17300).
Boiling point: bp3-4 95-107°
Index of refraction: nD32 1.4780
Absorption maximum: uv max (hexane): 224 nm (e 17300)
