ChemicalBook--->CAS DataBase List--->94-09-7

94-09-7

94-09-7 Structure

94-09-7 Structure
IdentificationBack Directory
[Name]

Benzocaine
[CAS]

94-09-7
[Synonyms]

4-AMINOBENZOIC ACID ETHYL ESTER
AETHOFORM
AKOS BBS-00003658
anesthesin
auralgan otic
BENZOCAINE
benzocaine bp98
BENZOCAINUM
ETHYL 4-AMINOBENZOATE
ethyl aminobenzoate
ETHYLAMINOBENZOATE-4
ETHYL P-AMINOBENZOATE
H-4-ABZ-OET
LABOTEST-BB LTBB000527
ORTHESIN
P-AMINOBENZOIC ACID ETHYL ESTER
parathesin
4-(Ethoxycarbonyl)aniline
4-amino-benzoicaciethylester
4-Carbethoxyaniline
[EINECS(EC#)]

202-303-5
[Molecular Formula]

C9H11NO2
[MDL Number]

MFCD00007892
[Molecular Weight]

165.19
[MOL File]

94-09-7.mol
Chemical PropertiesBack Directory
[Appearance]

white odourless crystals
[Melting point ]

88-90 °C
[Boiling point ]

172 °C (12.7517 mmHg)
[density ]

1.17
[refractive index ]

1.5600 (estimate)
[Fp ]

172°C/13mm
[storage temp. ]

0-6°C
[solubility ]

alcohol: soluble1 gm in 5 ml
[form ]

Crystalline Powder
[pka]

2.5(at 25℃)
[color ]

White
[Odor]

odorless
[Stability:]

Stable. Combustible. Incompatible with strong oxidizing agents.
[Water Solubility ]

Soluble in ethanol, chloroform, ethyl ether and dilute acids. Sparingly soluble in water
[Merck ]

14,1086
[BRN ]

638434
[InChIKey]

BLFLLBZGZJTVJG-UHFFFAOYSA-N
[LogP]

1.860
[CAS DataBase Reference]

94-09-7(CAS DataBase Reference)
[NIST Chemistry Reference]

Benzoic acid, 4-amino-, ethyl ester(94-09-7)
[EPA Substance Registry System]

94-09-7(EPA Substance)
Safety DataBack Directory
[Hazard Codes ]

Xi
[Risk Statements ]

R43:May cause sensitization by skin contact.
R36/37/38:Irritating to eyes, respiratory system and skin .
[Safety Statements ]

S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S37/39:Wear suitable gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S24:Avoid contact with skin .
[RIDADR ]

3077
[WGK Germany ]

2
[RTECS ]

DG2450000
[TSCA ]

Yes
[HazardClass ]

9
[PackingGroup ]

III
[HS Code ]

29224995
[Safety Profile]

Poison by ingestion and intraperitoneal routes. Human systemic effects by rectal route: methemoglobinemia/carboxyhemoglobinem ia in infants. A skin irritant and a mild sensitizer. Local contact may cause contact dermatitis. Used as a topical anesthetic and as a sun-screening agent. When heated to decomposition it emits highly toxic fumes of NOx. See also ETHYL ALCOHOL and ESTERS
[Hazardous Substances Data]

94-09-7(Hazardous Substances Data)
[Toxicity]

LD50 oral in rat: 3042mg/kg
Raw materials And Preparation ProductsBack Directory
[Raw materials]

4-Aminobenzoic acid-->4-Aminophthalic acid-->Ethyl p-nitrobenzoate
[Preparation Products]

4-Fluorobenzoic acid-->Benzonatate-->Ethyl 4-(butylamino)benzoate-->Ethyl 4-dimethylaminobenzoate-->Methyl isopropyl ether-->ETHYL 4-(5-FORMYL-2-FURYL)BENZOATE-->Diethyl (hydroxymethyl)phosphonate-->TRIMETHYLENE BIS(4-AMINOBENZOATE)-->4-AZIDOBENZOIC ACID-->ETHYL 4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)BENZOATE-->BOC-4-AMINOBENZYLALCOHOL-->Viaminate-->SGI-1027-->4-(2-OXO-PROPYL)-BENZOIC ACID ETHYL ESTER-->Benzocaine hydrochloride-->2-Aminobenzothiazole-6-carboxylic acid-->C.I.Disperse Yellow 102
Material Safety Data Sheet(MSDS)Back Directory
[msds information]

Benzocaine(94-09-7).msds
Questions And AnswerBack Directory
[Indications and Usage]

Benzocaine is a colorless trapezial crystal. Its melting point is 92℃ (88-90℃), boiling point is 183-184°C (1.87kPa). 1g of this drug is soluble in about 2500ml water, 5ml ethanol, 2ml chloroform, 4ml ether or 30-50ml almond oil and olive oil, and it is also soluble in dilute acid. It is stable in air, odorless, and slightly bitter.
Benzocaine is a lipid-soluble surface anesthetic, and it weaker than other local anesthetics such as lidocaine and tetracaine, so it will not cause any discomfort due to its anesthetizing effects when acting on mucosa. Benzocaine is a type of drug with relatively strong lipid-solubility and will bind with mucosa and the fatty layer of skin, but it will not easily penetrate into the body and cause poisoning. Benzocaine can be used as a precursor for Ossur imitation, orthocaine, and procaine. It is also used as a local anesthetic and can stop pain and itching. It is mainly used in pain and itch prevention on wounds, ulcer surfaces, mucous membrane surfaces and hemorrhoids. Its paste form can also lubricate and stop pain for the nasopharynx and endoscope. Benzocaine’s aural solution is used to alleviate acute congestion, concentrated otitis externa, and the pain and itching of swimming otitis. Benzocaine is also effective for toothaches, sore throat, oral ulcers, all kinds of hemorrhoids, anal fissures, and vulvar itching. Benzocaine can be used as a male sex organ numbing agent to slow ejaculation. It can also be used as a numbing lubricant for the pharynx and endoscope, and it can be used as a UV absorbing agent for cosmetics.
[Uses]

  1. Benzocaine is a local anaesthetic of the ester type with a poor solubility in water. The drug benzocaine is normally used as a topical pain reliever or as a common ingredient in cough drops. Benzocaine is used in multiple forms including lotion, gel, liquid, lozenges, and sprays. When Benzocaine is applied in any form it temporarily numbs or blocks the nerve endings, which leads to a decreases in the amount of pain. It is used in cattle, sheep, swine and horses for local and prolonged low epidural anaesthesia. Standard therapeutic doses of benzocaine ranged from 150 to 750 mg per animal. Benzocaine is also currently used as surface anaesthetic as ointments (0.5% benzocaine) for wounds and ulcerated surfaces in horses, cattle and sheep applied twice a day until healing.
  2. A commonly used topical pain reliever. Main active ingredient in anesthetic ointments.
  3. Anesthetic;Na+ channel blocker
  4. Benzocaine acts on the central nervous system, cardiovascular system, neuromuscular junctions and ganglion synapse. Its mechanism of action is to prevent the generation and conduction of the nerve impulse. Local anaesthetics block conduction by decreasing or preventing the large transient increase in the permeability of excitable membranes to Na+ that is produced by a slight depolarisation. This action of local anaesthetics is due to their direct interaction with voltage-sensitive Na+ channels. Benzocaine is mainly hydroxylated in the metabolite para-aminobenzoic acid (PABA) that inhibits the action of sulphonamides.
  5. Benzocaine is distributed in the body, crosses the placenta and is metabolised in the liver and in the plasma by non-specific cholinesterases. Benzocaine and its main metabolite (para-aminobenzoic acid) are excreted into urine.
  6. Benzocaine appears as a moderately toxic compound after single administration. The acute intraperitoneal LD50 value was 216 mg/kg bw in mice. Benzocaine may induce methemoglobinemia in several species such as sheep, cats and dogs.
[synthesis]

Benzocaine is produced by reduction of ethyl 4-nitrobenzoate with iron or by the acid-catalyzed esterification of 4-aminobenzoic acid with ethanol:
the synthesis of benzocaine
In a 5-mL round bottom flask, add 120 mg of 4-aminobenzoic acid (often called PABA for paminobenzoic acid), 1.5 mL of absolute ethanol (absolute ethanol is completely free of water and can be found on the hooded shevles), and 3 boiling chips. Heat this mixture on a sand bath until all the solid dissolves. Cool in ice and then add 0.25 mL of concentrated sulfuric acid dropwise. (One drop at a time.) A large amount of precipitate will form when the sulfuric acid is added, but this will dissolve during the reflux that follows. Attach an air condenser from the microscale kit, and reflux gently for 60- 75 min. Check periodically to be sure that the mixture is refluxing gently, and that the ring of condensation of solvent lies somewhere along the inner surface of the air condenser; loss of solvent will cause overheating and a significant decrease in yield.
Hazard InformationBack Directory
[Description]

Benzocaine (ethyl p-aminobenzoate) is used topically by itself or in combination with menthol or phenol in nonprescription dosage forms such as gels, creams, ointments, lotions, aerosols, and lozenges to relieve pain or irritation caused by such conditions as sunburn, insect bites, toothache, teething, cold sores or canker sores in or around the mouth, and fever blisters. Benzocaine is a lipophilic local anesthetic agent with a short duration of action.
Like most amino ester-type local anesthetics, it is easily hydrolyzed by plasma cholinesterase. Because of its low pKa, however, it is un-ionized under most physiological conditions and, therefore, can only bind to the lipid side of the local anesthetic receptor. It also can easily cross membranes into systemic circulation to cause systemic toxicities. Furthermore, being a PABA derivative, it has similar allergenic properties to procaine and is contraindicated with sulfonamide antibacterial agents.
[Chemical Properties]

white odourless crystals
[Definition]

ChEBI: Benzocaine is a benzoate ester having 4-aminobenzoic acid as the acid component and ethanol as the alcohol component. A surface anaesthetic, it is used to suppress the gag reflex, and as a lubricant and topical anaesthetic on the larynx, mouth, nasal cavity, respiratory tract, oesophagus, rectum, urinary tract, and vagina. It has a role as a topical anaesthetic, an antipruritic drug, an allergen and a sensitiser. It is a benzoate ester and a substituted aniline.
[Brand name]

Americaine (Fisons); Baby Anbesol (Whitehall-Robins).
[Biological Functions]

Benzocaine is a PABA derivative used primarily for topical application to skin and mucous membranes. Its low aqueous solubility allows it to stay at the site of application for long periods. Its minimal rate of absorption after topical administration is associated with a low incidence of systemic toxicity. Benzocaine is contraindicated in patients with known sensitivity to ester-linked anesthetics or PABA-containing compounds.
[Synthesis Reference(s)]

Journal of the American Chemical Society, 71, p. 4154, 1949 DOI: 10.1021/ja01180a513
Chemical and Pharmaceutical Bulletin, 29, p. 1443, 1981 DOI: 10.1248/cpb.29.1443
[General Description]

Benzocaine is a unique local anesthetic because it does notcontain a tertiary amine. The pKa of the aromatic amine is 3.5ensuring that benzocaine is uncharged at physiological pH.Because it is uncharged, it is not water soluble but is ideal fortopical applications. The onset of action is within 30 secondsand the duration of drug action is 10 to 15 minutes.
[Biochem/physiol Actions]

Benzocaine is the ethyl ester of p-aminobenzoic acid (PABA). Benzocaine acts to inhibit the voltage-dependent sodium channels (VDSCs) on the nerve membrane, stopping the propagation of the action potential.
[Clinical Use]

Benzocaine is used for endoscopy, bronchoscopy, and topicalanesthesia. Benzocaine is available as a 20% solution topicalspray, in a 1% gel for mucous membrane application, and a14% glycerin suspension for topical use in the outer ear.Toxicity to benzocaine can occur when the topical doseexceeds 200 to 300 mg resulting in methemoglobinemia.Infants and children are more susceptible to this and methemoglobinemiahas been reported after benzocaine lubricationof endotracheal tubes and after topical administration to treata painful diaper rash.
[Synthesis]

Benzocaine is the ethyl ester of 4-aminobenzoic acid (2.3.1). The classic, optimal way of benzocaine synthesis is the reduction of the nitro group of the ethyl ester of 4-nitrobenzoic acid to benzocaine by hydrogen, which generates directly in the reaction medium by the reaction of iron filings with dilute acids [24¨C26].

Synthesis_94-09-7

[storage]

Store at -20°C,protect from light
[Purification Methods]

Crystallise Benzocaine from EtOH/H2O or EtOH (m 93-94o), and dry it in air. [Beilstein 14 H 422, 14 IV 1129.]
[Structure and conformation]

Ethyl aminobenzoate, a para-aminobenzoate derivative (PABA)
Spectrum DetailBack Directory
[Spectrum Detail]

Benzocaine(94-09-7)MS
Benzocaine(94-09-7)1HNMR
Benzocaine(94-09-7)13CNMR
Benzocaine(94-09-7)IR1
Benzocaine(94-09-7)IR2
Benzocaine(94-09-7)IR3
Benzocaine(94-09-7)Raman
Benzocaine(94-09-7)ESR
Well-known Reagent Company Product InformationBack Directory
[Alfa Aesar]

Ethyl 4-aminobenzoate, 98%(94-09-7)
[TCI AMERICA]

Ethyl 4-Aminobenzoate,>99.0%(GC)(T)(94-09-7)
94-09-7 suppliers list
Company Name: Shanghai Longyu Biotechnology Co., Ltd.
Tel: +8619521488211 , +8619521488211
Website: www.chemicalbook.com/manufacturer/shanghai-longyu-biotechnology-164/
Company Name: Hefei TNJ Chemical Industry Co.,Ltd.
Tel: +86-0551-65418679 +8618949832763 , +8618949832763
Website: www.tnjchem.com
Company Name: career henan chemical co
Tel: +86-0371-86658258 +8613203830695 , +8613203830695
Website: www.coreychem.com/
Company Name: Hebei Mojin Biotechnology Co., Ltd
Tel: +86 13288715578 +8613288715578 , +8613288715578
Website: www.mojinchemical.com
Company Name: Wuhan Haorong Biotechnology Co.,ltd
Tel: +86-18565342920; +8618565342920 , +8618565342920
Website:
Company Name: Apeloa production Co.,Limited
Tel: +8619933239880 , +8619933239880
Website: www.apcl.com.cn/
Company Name: Wuhan Fortuna Chemical Co., Ltd
Tel: +86-027-59207850
Website: www.fortunachem.com/
Company Name: Shaanxi Dideu Medichem Co. Ltd
Tel: +86-29-81148696 +86-15536356810 , +86-15536356810
Website: https://www.chemicalbook.com/manufacturer/shaanxi-dideu-medichem-221/
Company Name: Hebei Yanxi Chemical Co., Ltd.
Tel: +8617531190177 , +8617531190177
Website: www.chemicalbook.com/manufacturer/hebei-yanxi-chemical-283/
Company Name: Dorne Chemical Technology co. LTD
Tel: +86-86-13583358881 +8618560316533 , +8618560316533
Website: www.chemicalbook.com/manufacturer/zibo-dorne-chemical-technology-403/
Company Name: Hebei Dangtong Import and export Co LTD
Tel: +86-13910575315 +86-13910575315 , +86-13910575315
Website: www.chemicalbook.com/showsupplierproductslist609684/0.htm
Company Name: Anhui Yiao New Material Technology Co., Ltd
Tel: +86-18033737140 +86-17354101231 , +86-17354101231
Website: www.chemicalbook.com/manufacturer/yiao%20new%20material%20technology%20-25052/
Company Name: Wuhan Han Sheng New Material Technology Co.,Ltd
Tel: +8617798174412 , +8617798174412
Website: www.hsnm.com.cn/
Company Name: Xiamen Wonderful Bio Technology Co., Ltd.
Tel: +8613043004613 , +8613043004613
Website: www.chinabmkpmk.com/
Company Name: Guangzhou Tengyue Chemical Co., Ltd.
Tel: +86-86-18148706580 +8618826483838 , +8618826483838
Website: www.chemicalbook.com/usermanager/login_en.aspx?redirect=&acceptscooki es=yes
Company Name: Shaanxi Haibo Biotechnology Co., Ltd
Tel: +undefined18602966907 , +undefined18602966907
Website: www.rozenbio.com/
Company Name: Jinan Million Pharmaceutical Co., Ltd
Tel: 0531-68659554 +8613031714605 , +8613031714605
Website: https://www.millionpharm.com/
Company Name: Hebei Xinsheng New Material Technology Co., LTD.
Tel: +86-16632316109 , +86-16632316109
Website: www.xsmaterial.com/admin/
Tags:94-09-7 Related Product Information
7240-38-2 100-41-4 140-88-5 141-78-6 150-13-0 619-45-4 138-84-1 3289-28-9 623-49-4 109-94-4 54965-21-8 75-00-3 119446-68-3 120-47-8 51-79-6 122-51-0 87-25-2 64-17-5