Title: Limonene
CAS Registry Number: 138-86-3
CAS Name: 1-Methyl-4-(1-methylethenyl)cyclohexene
Additional Names: p-mentha-1,8-diene; cinene; cajeputene; kautschin
Molecular Formula: C10H16
Molecular Weight: 136.23
Percent Composition: C 88.16%, H 11.84%
Literature References: Occurs in various ethereal oils, particularly in oils of lemon, orange, caraway, dill and bergamot. Isoln of d-limonene from mandarin peel oil (Citrus reticulata Blanco, Rutaceae): Kugler, Kováts, Helv. Chim. Acta 46, 1480 (1963). Review: J. L. Simonsen, The Terpenes vol. I (University Press, Cambridge, 2nd ed., 1947) pp 143-165.
Derivative Type: dl-Form
Additional Names: Inactive limonene; dipentene
Properties: Liquid. Pleasant lemon-like odor. bp763 175.5-176.5°. d420.85 0.8402. nD 1.4744. Practically insol in water. Miscible with alcohol. With dry HCl or HBr it forms monohalides, and with aq HCl or HBr, the dihalide.
Boiling point: bp763 175.5-176.5°
Index of refraction: nD 1.4744
Density: d420.85 0.8402
Derivative Type: d-Form
Properties: Liquid. bp763 175.5-176°. d421 0.8402. nD21 1.4743. [a]D19.5 +123.8°.
Boiling point: bp763 175.5-176°
Optical Rotation: [a]D19.5 +123.8°
Index of refraction: nD21 1.4743
Density: d421 0.8402
Derivative Type: l-Form
Properties: Liquid. bp763 175.5-176.5°. d420.5 0.8407. nD21 1.474. [a]D19.5 -101.3°.
Boiling point: bp763 175.5-176.5°
Optical Rotation: [a]D19.5 -101.3°
Index of refraction: nD21 1.474
Density: d420.5 0.8407
CAUTION: Skin irritant, sensitizer.
Use: Solvent, manuf resins; wetting and dispersing agent.

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