Phenothiazine

Description

Phenothiazine · CAS 92-84-2 · C12H9NS. UNII GS9EX7QNU6. Boiling Point: 700 °F at 760 mmHg (NTP, 1992); Boiling Point: 371 °C @ 760 MM HG; Boiling Point: 371 °C.

Identification

CAS Registry Number	92-84-2
PubChem CID	7108
Molecular formula	C12H9NS
IUPAC name	10H-phenothiazine
UNII (FDA)	GS9EX7QNU6

Computed Descriptors

Molecular Weight	199.27
XLogP3	4.2
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	199.04557046
Monoisotopic Mass	199.04557046
Topological Polar Surface Area	37.3
Heavy Atom Count	14
Formal Charge	0

Physical & Chemical Properties

Boiling Point	700 °F at 760 mmHg (NTP, 1992)
Boiling Point	371 °C @ 760 MM HG
Boiling Point	371 °C
Boiling Point	700 °F
Melting Point	365.9 to 366.6 °F (NTP, 1992)
Melting Point	185.1 °C
Melting Point	365 °F
Flash Point	202 °C
Density	1.34 g/cm³
Vapor Pressure	0 mmHg (approx) (NIOSH, 2024)

Physical description & handling notes

• Phenothiazine is a light green to steel-blue powder. Acquires a greenish-brown tint under exposure to sunlight. (NTP, 1992)
• Liquid; Dry Powder; Other Solid; Large Crystals
• Grayish-green to greenish-yellow solid; [NIOSH]
• YELLOW CRYSTALS. TURNS DARK GREEN ON EXPOSURE TO LIGHT.
• Grayish-green to greenish-yellow solid.
• Grayish-green to greenish-yellow solid. [insecticide]

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	0.7% (24 / 3466)

GHS Hazard Classification

GHS notification summary	0.7% (24 / 3466)
Reported hazard statements	H302 (94.2%), H317 (97.4%), H373 (93.9%), H400 (11.9%), H410 (11.9%), H412 (83.2%), H315, H335

Documented Uses

• Used to manufacture veterinary anthelmintics and other pharmaceuticals; [Merck Index, #7252]
• MFR OF DYES; PARENT CMPD FOR CHLORPROMAZINE & RELATED ANTIPSYCHOTIC DRUGS; POLYMERIZATION INHIBITOR; ANTIOXIDANT
• Used in control of insects that breed in manure
• Synthesis of promethazine hydrochloride
• Polymerization inhibitor for chloroprene
• For more Uses (Complete) data for PHENOTHIAZINE (10 total), please visit the HSDB record page.

Synonyms

PHENOTHIAZINE; 10H-Phenothiazine; 92-84-2; Thiodiphenylamine; Dibenzothiazine; Contaverm; Dibenzo-1,4-thiazine; Fenoverm; Nemazine; Phenosan; Feeno; Phenthiazine; Antiverm; Fentiazin; Helmetina; Lethelmin

Frequently Asked Questions

What are the CAS number and molecular formula of Phenothiazine?

CAS 92-84-2; molecular formula C12H9NS; molecular weight — g/mol.

What other names is Phenothiazine known by?

PHENOTHIAZINE, 10H-Phenothiazine, 92-84-2, Thiodiphenylamine, Dibenzothiazine, Contaverm.

What is the regulatory status of Phenothiazine?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is Phenothiazine classified as hazardous?

0.7% of GHS notifications report no hazard classification (24 of 3466).

What are the key physical properties of Phenothiazine?

Boiling Point: 700 °F at 760 mmHg (NTP, 1992); Boiling Point: 371 °C @ 760 MM HG; Boiling Point: 371 °C; Boiling Point: 700 °F.

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.