Ocimene
Title: Ocimene
CAS Registry Number: 29714-87-2
Molecular Formula: C10H16
Molecular Weight: 136.23
Percent Composition: C 88.16%, H 11.84%
Literature References: From the leaves of Ocimum basilicum L., Labiatae; Baronia dentigeroides Cheel, Rutaceae; Litsea zeylanica C. & T. Nees, Lauraceae; Homoranthus flavescens A. Cunn., Myrtaceae. From the fruits of Evodia rutaecarpa (Juss.) Hook. f. & Thoms., Rutaceae. Exists in two modifications: a-form, 3,7-dimethyl-1,3,7-octatriene; and b-form, 3,7-dimethyl-1,3,6-octatriene. Cis and trans refers to the stereochemistry at the double bond between positions 3 and 4. Isoln and structure: van Romburgh, Proc. K. Ned. Akad. Wet. 3, 454 (1900); Enklaar, Rec. Trav. Chim. 26, 157 (1907); 27, 422 (1908); 36, 215 (1917); 45, 337 (1926). Structure: Sutherland, J. Am. Chem. Soc. 74, 2688 (1952). Separation of isomers: Ohloff et al., Ann. 675, 83 (1964). Synthesis of trans-a-form: O. P. Vig et al., Indian J. Chem. 7, 1111 (1969). Stereospecific synthesis: O. P. Vig et al., ibid. 15B, 25 (1977).
Properties: Oil. Pleasant odor. Mixture of isomers. bp70 100°. d420 0.8006. nD20 1.4862. uv max (methanol): 233 nm (e 26,200). Practically insol in water. Sol in alcohol, chloroform, ether, glacial acetic acid.
Boiling point: bp70 100°
Index of refraction: nD20 1.4862
Absorption maximum: uv max (methanol): 233 nm (e 26,200)
Density: d420 0.8006
 
Derivative Type: trans-b-Form
CAS Registry Number: 3779-61-1
Properties: d420 0.799. nD20 1.4893. uv max (ethanol): 232 nm (e 27,600).
Index of refraction: nD20 1.4893
Absorption maximum: uv max (ethanol): 232 nm (e 27,600)
Density: d420 0.799
 
Derivative Type: cis-b-Form
Properties: d420 0.799. nD20 1.4877. uv max (ethanol): 237.5 nm (e 21,000).
Index of refraction: nD20 1.4877
Absorption maximum: uv max (ethanol): 237.5 nm (e 21,000)
Density: d420 0.799
 
Derivative Type: trans-a-Form
Properties: d420 0.793. nD20 1.4802. uv max (ethanol): 231 nm (e 27,300).
Index of refraction: nD20 1.4802
Absorption maximum: uv max (ethanol): 231 nm (e 27,300)
Density: d420 0.793
 
Derivative Type: cis-a-Form
Properties: d420 0.794. nD20 1.4789. uv max (ethanol): 234.5 nm (e 21,600).
Index of refraction: nD20 1.4789
Absorption maximum: uv max (ethanol): 234.5 nm (e 21,600)
Density: d420 0.794

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