对氯苯氧基乙酸

Description

4-Chlorophenoxyacetic acid · CAS 122-88-3 · C8H7ClO3. UNII 4EMM3U5P3K. Melting Point: 156.5 °C; Solubility: In water, 957 mg/L at 25 °C; Vapor Pressure: 0.000318 [mmHg].

Identification

CAS Registry Number	122-88-3
PubChem CID	26229
Molecular formula	C8H7ClO3
IUPAC name	2-(4-chlorophenoxy)acetic acid
UNII (FDA)	4EMM3U5P3K

Computed Descriptors

Molecular Weight	186.59
XLogP3	2.2
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	3
Exact Mass	186.0083718
Monoisotopic Mass	186.0083718
Topological Polar Surface Area	46.5
Heavy Atom Count	12
Formal Charge	0

Physical & Chemical Properties

Melting Point	156.5 °C
Solubility	In water, 957 mg/L at 25 °C
Vapor Pressure	0.000318 [mmHg]
LogP	log Kow = 2.25
LogP	2.23
Dissociation Constants	pKa = 3.56

Physical description & handling notes

• Odorless solid; [HSDB] White or off-white powder; [MSDSonline]
• Prisms or needles from water
• It is stable at elevated temperatures (54 °C) and on exposure to metals, but degrades (30% loss in 24 hours) on exposure to sunlight.
• When heated to decomposition it emits toxic fumes of /hydrogen chloride/.
• Odorless
• 140.9 Ų [M-H]- [CCS Type: DT; Buffer gas: N2; Ionization: ESI-; Dataset: TOXCAST; Source Identifier: DTXSID9034282]

GHS Hazard Classification

Reported hazard statements	H302, H319

Documented Uses

• Used as a specialized plant growth regulator to improve fruit set in tomatoes, berries, and other fruit; May also be used to replace pollination; [HSDB] Used to regulate root growth of mung beans in seed germination; [Reference #1]
• Registration cancelled for use on tomatoes in 1994; [Reference #1]
• ... Specific plant growth regulator to improve fruit set in tomatoes; it can also replace pollination.
• Reagent grade p-chlorophenoxyacetic acid was found to contain 2,4-D as an impurity (1.0%) as well as traces of 2,4-dichlorophenols.
• Acetic acid, 2-(4-chlorophenoxy)-: ACTIVE
• SPRAY APPLICATION OF 4-CHLOROPHENOXYACETIC ACID (2 AND 4 PPM) TO GRAPES INCREASED BERRY SET SIGNIFICANTLY OVER CONTROLS. BERRY SET INCREASED WITH INCREASE IN 4-CHLOROPHENOXYACETIC ACID CONCN. BERRY DROP WAS ALSO SIGNIFICANTLY REDUCED, AND WITH INCREASED AUXIN CONCN CORRESPONDING DECREASE IN BERRY DROP WAS OBSERVED. PANICLE DRYING WAS SEVERE IN THIS CULTIVAR WHICH WAS EFFECTIVELY REDUCED BY AUXIN APPLICATION.

Synonyms

4-CHLOROPHENOXYACETIC ACID; 122-88-3; (4-Chlorophenoxy)acetic acid; Sure-Set; Acetic acid, (4-chlorophenoxy)-; Tomato Fix; Tomato hold; (p-Chlorophenoxy)acetic acid; p-Chlorophenoxyacetic acid; Acetic acid, (p-chlorophenoxy)-; 4CPA; Parachlorophenoxyacetic acid; BI 12; NSC 8769; TOMATONE; DTXSID9034282

Frequently Asked Questions

What are the CAS number and molecular formula of 4-Chlorophenoxyacetic acid?

CAS 122-88-3; molecular formula C8H7ClO3; molecular weight — g/mol.

What other names is 4-Chlorophenoxyacetic acid known by?

4-CHLOROPHENOXYACETIC ACID, 122-88-3, (4-Chlorophenoxy)acetic acid, Sure-Set, Acetic acid, (4-chlorophenoxy)-, Tomato Fix.

Is 4-Chlorophenoxyacetic acid classified as hazardous?

Hazard statements reported: H302, H319.

What are the key physical properties of 4-Chlorophenoxyacetic acid?

Melting Point: 156.5 °C; Solubility: In water, 957 mg/L at 25 °C; Vapor Pressure: 0.000318 [mmHg]; LogP: log Kow = 2.25.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.