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alpha-Terpinene

alpha-Terpinene Structure
alpha-Terpinene structure
CAS No.
99-86-5
Chemical Name:
alpha-Terpinene
Synonyms
1,3-Cyclohexadiene, 1-methyl-4-(1-methylethyl)-;Terpilene;A-TERPINENE;P-MENTHA-1,3-DIENE;FEMA 3558;1-methyl-4-(1-methylethyl)-1,3-cyclohexadiene;TERPINENE ALPHA;ALPHA-TERPINEN;α-Terpinene ,90%;1,3-p-menthadiene
CBNumber:
CB5266720
Molecular Formula:
C10H16
Molecular Weight:
136.23
MDL Number:
MFCD00001534
MOL File:
99-86-5.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-07-17 09:03:53
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alpha-Terpinene Properties

Melting point -59.03°C (estimate)
Boiling point 173-175 °C(lit.)
Density 0.837 g/mL at 25 °C(lit.)
vapor pressure 2.22hPa at 25℃
FEMA 3558 | P-MENTHA-1,3-DIENE
refractive index n20/D 1.478(lit.)
FLAVIS Number 01.019 | alpha-Terpinene
Flash point 115 °F
storage temp. 2-8°C
solubility 95% ethanol: soluble1ml/2ml, clear, colorless
form Liquid
Specific Gravity 0.84
color Clear colorless to light yellow
Odor at 10.00 % in dipropylene glycol. woody terpene lemon herbal medicinal citrus
Odor Type woody
biological source synthetic
Water Solubility Soluble in ether, alcohol, and ethanol (100 mg/ml). Insoluble in water.
Merck 14,9170
JECFA Number 1339
BRN 1853379
Henry's Law Constant 5.1×10-4 mol/(m3Pa) at 25℃, Plyasunov and Shock (2000)
Dielectric constant 2.7000000000000002
Stability Light Sensitive
Cosmetics Ingredients Functions PERFUMING
InChI 1S/C10H16/c1-8(2)10-6-4-9(3)5-7-10/h4,6,8H,5,7H2,1-3H3
InChIKey YHQGMYUVUMAZJR-UHFFFAOYSA-N
SMILES CC(C)C1=CC=C(C)CC1
LogP 5.3 at 35℃
Substances Added to Food (formerly EAFUS) ALPHA-TERPINENE
FDA 21 CFR 172.515
EWG's Food Scores 1-2
FDA UNII I24X278AP1
EPA Substance Registry System 1,3-Cyclohexadiene, 1-methyl-4-(1-methylethyl)- (99-86-5)
UNSPSC Code 41116107
NACRES NA.24

SAFETY

Risk and Safety Statements

Symbol(GHS)  Flame (GHS02)Exclamation Mark (GHS07)Environment (GHS09)
GHS02,GHS07,GHS09
Signal word  Warning
Hazard statements  H226-H302-H317-H319-H411
Precautionary statements  P210-P273-P280-P301+P312-P303+P361+P353-P305+P351+P338
Hazard Codes  Xn,N,Xi
Risk Statements  10-22-36/37/38-51/53
Safety Statements  26-36/37-61-62-36
RIDADR  UN 2319 3/PG 3
WGK Germany  2
RTECS  OS8060000
F  10-23
TSCA  TSCA listed
HazardClass  3.2
PackingGroup  III
HS Code  29021990
Storage Class 3 - Flammable liquids
Hazard Classifications Acute Tox. 4 Oral
Aquatic Chronic 2
Asp. Tox. 1
Eye Irrit. 2
Flam. Liq. 3
Skin Sens. 1B
Toxicity The acute oral LD50 value in rats was reported as 1.68 g/kg (1*46-1 -90 g/kg) (Moreno, 1973). Because of its action as a liver poison and methaemoglobin former, α-terpinene should be used very sparingly, or not at all, in foods (Br & Griepentrog, 1967).
REACH Registrations Active
NFPA 704
2
2 0

alpha-Terpinene price More Price(66)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich W355801 α-Terpinene ≥89%, FCC, FG 99-86-5 1 each $58 2026-04-30 Buy
Sigma-Aldrich W355801 α-Terpinene ≥89%, FCC, FG 99-86-5 1kg $83.6 2026-04-30 Buy
Sigma-Aldrich W355801 α-Terpinene ≥89%, FCC, FG 99-86-5 8kg $489 2026-04-30 Buy
Sigma-Aldrich 86473 α-Terpinene ≥95.0% (GC) 99-86-5 1ml $229 2026-04-30 Buy
Sigma-Aldrich 223182 α-Terpinene 85% 99-86-5 100ml $56.6 2026-04-30 Buy
Product number Packaging Price Buy
W355801 1 each $58 Buy
W355801 1kg $83.6 Buy
W355801 8kg $489 Buy
86473 1ml $229 Buy
223182 100ml $56.6 Buy

alpha-Terpinene Chemical Properties, Uses, Production

Chemical Properties

alpha-Terpinene is a clear colorless to light yellow liquid with a woody, terpene, lemon odor with a lemony flavor, becoming bitter at high levels.   It dissolves in ethanol and most non-volatile oils but does not dissolve in water. It is found naturally in oils such as cardamom, sweet oregano, and coriander seed oil.

Occurrence

Reported found in roots, stems, leaves and flowers of Echinacea species. Also reported found in in tea tree oil, papaya fruit, grapefruit, lemon, lime, mandarin, oranage, spearmint, citrus peel oils, cranberry, currants, guava, grapes, raspberry, peach, carrot, celery, cinnamon, clove, cumin seed, ginger, peppermint and corn mint oils, other mentha oils, nutmeg, pepper, mace, parsley, thymus, rum, tea, filberts, pecans, soybeans, passion fruit, beans, sweet marjoram, starfruit, mango, cardamom, coriander seed, origanum, prickly pear, litchi, calamus, dill herb, lovage seed and leaf, juniper berries, laurel, fennel, rosemary, buchu oil, tur meric, sage, nectarines and many other sources.

Uses

It can be used as a chemical fragrance essential oil and spices. It is used as a flavoring and fragrance chemical used in the personal care and cosmetic and food industries. Also used in the pharmaceutical, electronics, food processing, semi-conductor manufacturing industries.

Uses

α-Terpinene is suitable for use in a study to evaluate the antimycotic properties of Melaleuca alternifolia essential oil (tea tree oil, TTO). 1 It is suitable for use to investigate the in vitro antibacterial activity of the essential oils extracted from the fruits of Coriandrum sativum L. and Foeniculum vulgare Miller var. vulgare (Miller).

Preparation

May be obtained by isolation from the terpene fraction of sweet orange oil or orange terpenes (8 to 10% of the total monoterpenes); by isolation from fractions of American turpentine oil; from 1-methyl-4-isopropylcyclohexadien-1,3-one-2; also from terpinene dihydrochloride with aniline.

Definition

ChEBI: Alpha-terpinene is one of three isomeric monoterpenes differing in the positions of their two double bonds (beta- and gamma-terpinene being the others). In alpha-terpinene the double bonds are at the 1- and 3-positions of the p-menthane skeleton. It has a role as a volatile oil component and a plant metabolite. It is a monoterpene and a cyclohexadiene.

Production Methods

alpha-Terpinene can be produced
1) by isolation from the Terpene fraction of sweet Orange oil or "Orange terpenes". The title material may constitute as much as 8 to 10% of the total Monoterpenes.
2) by isolation from fractions of American Turpentine oil.
3) from 1-Methyl-4-iso-propylcyclohexadien-1,3-one-2.
4) from Terpinene dihydrochloride with Aniline.

Aroma threshold values

Aroma characteristics at 10%: citrusy, woody, terpy with camphoraceous and thymol notes; it has spicy and juicy citrus nuances.

Taste threshold values

Taste characteristics at 5 to 100 ppm: terpy, woody, piney, citrus lemon and lime with spice and mint nuances.

General Description

α-Terpinene, a volatile essential oil derived from Melaleuca alternifolia, shows antimicrobial properties against various human pathogens.

Flammability and Explosibility

Flammable

Biochem/physiol Actions

Odor at 10%

Pharmacology

Combinations of terpenes, such as terpinene, with nonionic surfactants and stabilizers have been patented for use as gallstone solvents. Artificial or human cholesterol calculi placed in terpinene with or without human bile at 37°C were dissolved within 1-2 hr (Hisamitsu Pharmaceutical Co., Inc., 1973).

Safety Profile

Moderately toxic by ingestion. When heated to decomposition it emits acrid smoke and irritating fumes.

alpha-Terpinene Preparation Products And Raw materials

Raw materials

Orange sweet oil Turpentine oil Terpene 3,7-dimethylocta-2,6-dienyl 2-chloroacetate (+)-2-Carene
cis-4-hydroxy-alpha,alpha,4-trimethylcyclohexanemethanol gamma-Terpineol (1S)-(+)-3-Carene 3-methyl-6-(1-methylethylidene)cyclohexene alpha-Terpineol
Sulfuric acid

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Preparation Products

1,8-Cineole p-menthatriene,p-mentha-1,3,8-triene 2-Bornene Terpinolene

alpha-Terpinene Suppliers

Global Suppliers ( 345)
Supplier Tel Email Country ProdList Advantage
Wuhan kemike Biomedical Technology Co., Ltd 027-13163388153 13163388153 yeqiu416@163.com China 8787 58
JiangXi GreeN Spices Co.,Ltd. 17379691226 17379691226 2645286670@qq.com China 251 58
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 4006356688 18621169109 market03@meryer.com China 40202 62
TCI (Shanghai) Development Co., Ltd. 021-67121386 Sales-CN@TCIchemicals.com China 24512 81
Beijing HwrkChemical Technology Co., Ltd 89508211 18501085097 sales.bj@hwrkchemical.com China 9407 55
Energy Chemical 400-0056266 sales8178@energy-chemical.com China 44850 61
Adamas Reagent, Ltd. 400-6009262 15618770481 yhx@titansci.com China 14098 59
Shanghai Longsheng chemical Co.,Ltd. 58099637 13585536065 sales@shlschem.com China 9880 59
Shanghai Hanhong Scientific Co.,Ltd. 021-54306202 13764082696 info@hanhongsci.com China 42917 64
Supplier Advantage
Wuhan kemike Biomedical Technology Co., Ltd 58
JiangXi GreeN Spices Co.,Ltd. 58
J & K SCIENTIFIC LTD. 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 62
TCI (Shanghai) Development Co., Ltd. 81
Beijing HwrkChemical Technology Co., Ltd 55
Energy Chemical 61
Adamas Reagent, Ltd. 59
Shanghai Longsheng chemical Co.,Ltd. 59
Shanghai Hanhong Scientific Co.,Ltd. 64

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View Latest Price from alpha-Terpinene manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
alpha-Terpinene pictures 2026-09-02 alpha-Terpinene
99-86-5
 $1.00-100.00 1KG 99% Henan Fengda Chemical Co., Ltd
α-Terpinene pictures 2026-07-17 α-Terpinene
99-86-5
 $31.00 96.04% 10g TargetMol Chemicals Inc.
alpha-Terpinene pictures 2026-05-28 alpha-Terpinene
99-86-5
 $20.00-50.00 1KG 99% 10000kg Hebei Chuanghai Biotechnology Co,.LTD
  • alpha-Terpinene pictures
  • alpha-Terpinene
    99-86-5
  • $20.00-50.00
  • 99%
  • Hebei Chuanghai Biotechnology Co,.LTD

alpha-Terpinene Spectrum

ALPHA-TERPINENE(99-86-5)MSALPHA-TERPINENE(99-86-5)1HNMRALPHA-TERPINENE(99-86-5)13CNMRALPHA-TERPINENE(99-86-5)IR1ALPHA-TERPINENE(99-86-5)Raman

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1,3-Cyclohexadiene, 1-methyl-4-isopropyl- 1,3-p-menthadiene 1-Isopropyl-4-methyl-cyclohexa-1,3-diene ALPHA-TERPINEN ALPHA-TERPINENE ALPHA TERPINENE P&F FCC TERPINEOL P&F FCC ALPHA-TERPINENE 89+% FCC alpha-Terpinene, tech., 90% α-terpinene,1-methyl-4-(1-methylethyl)-1,3-cyclohexadiene ALPHA-ANDGAMMA-TERPINENES PARA-MENTHA-1,3-DIENE 1,3-Cyclohexadiene,1-methy TERPINENE, A- TERPINENE ALPHA 1-Methyl-4-isopropylcyclohexadiene-1,3 3-Cyclohexadiene,1-methyl-4-(1-methylethyl)-1 4-isopropyl-1-methyl-1,3-cyclohexadiene alpha-Terpine 1-ISOPROPYL-4-METHYL-1,3-CYCLOHEXADIENE 1-methyl-4-propan-2-ylcyclohexa-1,3-diene alpha-Terpinene 99-86-5 alpha-Terpinene solution A-TERPINENE WITH GC ALPHA-TERPINENE, NATURAL 1-Isopropyl-4-methyl-1,3-cyclohexadiene, p-Mentha-1,3-diene 1-Methyl-4-isopropyl-3-c α-Terpinene ,90% alpha-Terpinene, tech., 90% 100ML alpha-Terpinene, tech., 90% 500ML α-Terpinene, tech., 90% 1-methyl-4-(1-methylethyl)-1,3-cyclohexadiene 1-methyl-4-(1-methylethyl)-3-cyclohexadiene 1-Methyl-4-isopropyl-1,3-cyclohexadiene Alpha-terpinene, 90%,tech. alpha-Terpinene >=95.0% (GC) α-Terpinene> alpha-Terpinene@100 μg/mL in Methanol ALPHA-TERPINENE ISO 9001：2015 REACH α-Terpinene (~90%) Phenyl Acetate Impurity 39 alpha-Terpinene 1000 μg/ml Methanol C17322320 alpha-Terpinene alpha-Terpinene in Acetonitrile α-Terpinene, 10 mM in DMSO α-Terpinene, ≥89% alpha-Terpinene 2000 μg/mL in Acetonitrile a-Terpinene (~90%) α-Terpinene 1,3-Cyclohexadiene, 1-methyl-4-(1-methylethyl)- 1-methyl-4-isopropyl-3-cyclohexadiene A-TERPINENE FEMA 3558 P-MENTHA-1,3-DIENE Terpilene α-Terpinene(Terpilene,alpha-Terpinene,|á-Terpinen) α-Terpinene,1-Isopropyl-4-methyl-1,3-cyclohexadiene, p-Mentha-1,3-diene 99-86-5