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Name	4-Hydrazinobenzenesulfonic acid	EINECS	202-694-2
CAS No.	98-71-5	Density	1.583g/cm³
PSA	100.80000	LogP	2.07300
Solubility	soluble	Melting Point	Decomposes
Formula	C6H8 N2 O3 S	Boiling Point	°Cat760mmHg
Molecular Weight	188.207	Flash Point	°C
Transport Information	25kgs	Appearance	yellow powder
Safety	Moderately toxic by ingestion. When heated to decomposition it emits very toxic fumes of SO_x and NO_x.	Risk Codes	36/37/38
Molecular Structure		Hazard Symbols	UN NO.
Synonyms	Benzenesulfonicacid, 4-hydrazino- (9CI); Benzenesulfonic acid, p-hydrazino- (6CI,7CI,8CI);4-Hydrazinobenzenesulfonic acid; 4-Sulfophenylhydrazine; NSC 1608;Phenylhydrazine-4-sulfonic acid; Phenylhydrazine-p-sulfonic acid;p-Hydrazinobenzenesulfonic acid; p-Hydrazinophenylsulfonic acid;p-Sulfophenylhydrazine	Article Data	35

4-Hydrazinobenzenesulfonic acid Synthetic route

: 2154-66-7
4-sulfobenzenediazonium

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
Stage #1: 4-sulfobenzenediazonium With sodium sulphite-heptahydrate In water at 0 - 5℃; for 2h; Stage #2: With hydrogenchloride In water for 0.5h;	96%
With sulfuric acid; sodium sulfite at 0 - 5℃;	95%

: 121-57-3
4-aminobenzene sulfonic acid

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
Stage #1: 4-aminobenzene sulfonic acid With sulfuric acid; sodium carbonate; sodium nitrite In water at 5℃; Stage #2: With hydrogenchloride; sodium sulfite In water at 5℃; Reflux;	85%
Stage #1: 4-aminobenzene sulfonic acid With sulfuric acid; sodium carbonate; sodium nitrite In water at 12℃; Cooling with ice; Stage #2: With sodium sulfite In water at 5℃; Heating; Stage #3: With hydrogenchloride; zinc In water at 20℃; for 12h;	74%
Diazotization.Behandeln mit Na2SO3 und Spalten mit Salzsaeure;

: 4-Sulfo-benzenediazonium; hydrogen sulfate

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
Stage #1: 4-Sulfo-benzenediazonium; hydrogen sulfate With sodium sulfite In water Heating / reflux; Stage #2: With hydrogenchloride In water	85%

: 305-80-6
4-diazobenzenesulfonic acid

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
With potassium sulfite Kochen mit konz. Salzsaeure;
With sodium dithionite Hydrolyse des Reaktionsprodukts mit kochender Salzsaeure;

: 61734-81-4
4-nitroamino-benzenesulfonic acid

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
With sodium amalgam

: 64-17-5
ethanol

: 4-[N'-(α-hydroxy-3,4-methylenedioxy-benzyl)-hydrazino]-benzenesulfonic acid

A: 120-57-0
piperonal

B: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
allmaehliche Zersetzung;

: 4-[N'-(α-hydroxy-3,4-methylenedioxy-benzyl)-hydrazino]-benzenesulfonic acid

: 64-19-7
acetic acid

A: 120-57-0
piperonal

B: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
schnelle Zersetzung;

: 100-63-0
phenylhydrazine

: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
With sulfuric acid at 80 - 100℃;

: 4-[N'-(α-hydroxy-3,4-methylenedioxy-benzyl)-hydrazino]-benzenesulfonic acid

: 7732-18-5
water

A: 120-57-0
piperonal

B: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
allmaehliche Zersetzung;

: 4-[N'-(α-hydroxy-3,4-methylenedioxy-benzyl)-hydrazino]-benzenesulfonic acid

hot water: hot water

A: 120-57-0
piperonal

B: 98-71-5
4-hydrazino-benzenesulfonic acid

Conditions

Conditions	Yield
schnelle Zersetzung;

4-Hydrazinobenzenesulfonic acid Chemical Properties

Phenylhydrazine-p-Sulfonic Acid(98-71-5) is also named as 4-hydrazino-benzenesulfonicaci;4-sulfophenylhydrazine;6,7-Dihydro-5,8-dimethyldibenzo[b,j][1,10]phenanthroline;Phenylhydrazinesulfonic acid;Sulfanilic acid, N-amino-;p-Hydrazinophenylsulfonic acid;p-Hydrazinobenzenesulfonic acid,and so on.Phenylhydrazine-p-Sulfonic Acid(98-71-5) is white to light yellow crystal powder.

CAS: 98-71-5
Molecular Formula: C₆H₈N₂O₃S
Molecular Weight: 188.2
Molecular structure:
EINECS: 202-694-2
Melting point: 285°C
Merck: 4773
Index of Refraction: 1.669
Molar Refractivity: 44.37 cm³
Molar Volume: 118.8 cm³
Polarizability: 17.59 10^-24cm³
Surface Tension: 80.9 dyne/cm
Density: 1.583 g/cm³

4-Hydrazinobenzenesulfonic acid Uses

Phenylhydrazine-p-Sulfonic Acid(98-71-5) is commonly used as a dye intermediate.

4-Hydrazinobenzenesulfonic acid Toxicity Data With Reference

orl-rat LDLo:500 mg/kg

JPETAB Journal of Pharmacology and Experimental Therapeutics. 90 (1947),260.

RTECS: DB6900000

4-Hydrazinobenzenesulfonic acid Consensus Reports

Reported in EPA TSCA Inventory.

4-Hydrazinobenzenesulfonic acid Safety Profile

Moderately toxic by ingestion. When heated to decomposition it emits very toxic fumes of SO_x and NO_x.

Hazard Codes: Xi
Risk Statements: 36/37/38 (36/37/38: Irritating to eyes, respiratory system and skin)
Safety Statements: 26-36/37/39 (26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 36/37/39: Wear suitable protective clothing, gloves and eye/face protection)
Hazard Note: Irritant

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