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Name	Vat Red 41	EINECS	208-336-1
CAS No.	522-75-8	Density	1.544 g/cm³
PSA	84.74000	LogP	4.17520
Solubility	1mg/L	Melting Point	280°C(lit.)
Formula	C₁₆H₈O₂S₂	Boiling Point	409.2 °C at 760 mmHg
Molecular Weight	296.37	Flash Point	177 °C
Transport Information	N/A	Appearance	N/A
Safety	26-36	Risk Codes	36/37/38
Molecular Structure		Hazard Symbols	N/A
Synonyms	Thioindigo(6CI);[D2,2'(3H,3'H)-Bibenzo[b]thiophene]-3,3'-dione(7CI,8CI);Antinolo Red B;C.I. 73300;C.I. Disperse Red 364;C.I. Solvent Red242;C.I. Vat Red 41;Ciba Pink B;Disperse Red 364;Durindone Printing Red B;Durindone Red B;Durindone Red BP;Helindon Red BB;Isothioindigo;Kenawax Fluorescent Red 3BYP;Plast Red D 54;SamaronBrilliant Pink 5B;Solvent Red 242;Thioindigo Red B;Thioindigo red C;Tyrian Red A 5B;Vat Red 5B;

Vat Red 41 Synthetic route

: 522-75-8
thioindigo

: 88-21-1
2-amino-1-benzenesulfonic acid

Conditions

Conditions	Yield
With (2,2':6',2''-terpyridine)(pyridine-2-carboxylate)iron(II)chloride; sodium hydroxide In water; acetonitrile	95%

: 522-75-8
thioindigo

: C98H80O24S6(6-)*6Na(1+)

: C16H8O2S2*C98H80O24S6(6-)*6Na(1+)

Conditions

Conditions	Yield
In water at 20℃; for 0.666667h; Sonication;	36%

: bis(acetonitrile)bis(2,4-pentanedionato)ruthenium(II)

: 522-75-8
thioindigo

A: C26H22O6RuS2

: C36H36O10Ru2S2

Conditions

Conditions	Yield
In tetrahydrofuran for 6h; Reflux; Inert atmosphere;	A 35% B 30%

: 522-75-8
thioindigo

: 804448-33-7
3,3'-bis-sulfooxy-[2,2']bi[benzo[b]thiophenyl]

Conditions

Conditions	Yield
With chlorosulfonic acid; sodium acetate; zinc In ethyl acetate at 40℃; for 0.5h;

: 522-75-8
thioindigo

: 36239-09-5
ethyl chlorocarbonylacetate

: C26H22O8S2

Conditions

Conditions	Yield
With sodium acetate; zinc In ethyl acetate at 40℃;

: 522-75-8
thioindigo

: 36239-09-5
ethyl chlorocarbonylacetate

: C21H16O5S2

Conditions

Conditions	Yield
With sodium acetate; zinc In ethyl acetate at 40℃; for 0.5h;

: 14254-57-0
4-(chlorocarbonyl)pyridine

: 522-75-8
thioindigo

: C28H16N2O4S2

Conditions

Conditions	Yield
With sodium acetate; zinc In ethyl acetate at 40℃; for 0.5h;

Vat Red 41 Chemical Properties

IUPAC Name: 4,4'-Diisothioindigo
The MF of 4,4'-Diisothioindigo (522-75-8) is C₁₆H₈O₂S₂.

The MW of 4,4'-Diisothioindigo (522-75-8) is 296.36.
Synonyms of 4,4'-Diisothioindigo (522-75-8): 2-(3-Oxobenzo(b)thien-2(3H)-ylidene)benzo(b)thiophene-3(2H)-one ; Antinolo red B ; Benzo(b)thiophen-3(2H)-one, 2-(3-oxobenzo(b)thien-2(3H)-ylidene)- ; 4,4'-Diisothioindigo
Product Categories: Azobenzene, etc. (Photochromic Compounds);Functional Materials;Photochromic Compounds;Solvent Dyestuff
Index of Refraction: 1.797
EINECS: 208-336-1
Density:: 1.544 g/ml
Flash Point: 177 °C
Boiling Point: 409.2 °C
Colour Index: 73300

Vat Red 41 Uses

4,4'-Diisothioindigo (522-75-8) is mainly used for coloring a variety of plastics such as polystyrene, polycarbonate, ABS resin, cellulose acetate and so on. Can also be used for polyester fiber puree color.

Vat Red 41 Toxicity Data With Reference

ipr-rat LD50:4170 mg/kg

GISAAA Gigiena i Sanitariya. 50 (8)(1985),91.

Vat Red 41 Consensus Reports

Reported in EPA TSCA Inventory.

Vat Red 41 Safety Profile

Mildly toxic by intraperitoneal route. When heated to decomposition it emits toxic vapors of SO_x.
Safety information of 4,4'-Diisothioindigo (522-75-8):
Risk Statements
36/37/38 Irritating to eyes, respiratory system and skin
Safety Statements
26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36 Wear suitable protective clothing
RTECS DT4330000

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