Squaric acid

Modify Date: 2024-01-01 21:43:02

Squaric acid structure	Common Name	Squaric acid
	CAS Number	2892-51-5	Molecular Weight	114.056
	Density	2.4±0.1 g/cm3	Boiling Point	251.0±50.0 °C at 760 mmHg
	Molecular Formula	C₄H₂O₄	Melting Point	>300 °C(lit.)
	MSDS	Chinese USA	Flash Point	119.8±26.6 °C
	Symbol	GHS07	Signal Word	Warning

Name	squaric acid
Synonym	More Synonyms

Density	2.4±0.1 g/cm3
Boiling Point	251.0±50.0 °C at 760 mmHg
Melting Point	>300 °C(lit.)
Molecular Formula	C₄H₂O₄
Molecular Weight	114.056
Flash Point	119.8±26.6 °C
Exact Mass	113.995308
PSA	74.60000
LogP	-1.70
Vapour Pressure	0.0±1.1 mmHg at 25°C
Index of Refraction	1.872
Storage condition	-20°C
Water Solubility	20 g/L (30 ºC)

CHEMICAL IDENTIFICATION

RTECS NUMBER :: GU1800000

CHEMICAL NAME :: Cyclobutene-1,2-dione, 3,4-dihydroxy-

CAS REGISTRY NUMBER :: 2892-51-5

BEILSTEIN REFERENCE NO. :: 0774275

LAST UPDATED :: 199701

DATA ITEMS CITED :: 2

MOLECULAR FORMULA :: C4-H2-O4

MOLECULAR WEIGHT :: 114.06

WISWESSER LINE NOTATION :: L4VVTJ CQ DQ

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 368 mg/kg/92W-I

TOXIC EFFECTS :: Tumorigenic - equivocal tumorigenic agent by RTECS criteria Tumorigenic - tumors at site of application

REFERENCE :: JNCIAM Journal of the National Cancer Institute. (Washington, DC) V.1-60, 1940-78. For publisher information, see JJIND8. Volume(issue)/page/year: 46,143,1971

Symbol	GHS07
Signal Word	Warning
Hazard Statements	H315-H317-H319-H335
Precautionary Statements	P261-P280-P305 + P351 + P338
Personal Protective Equipment	dust mask type N95 (US);Eyeshields;Faceshields;Gloves
Hazard Codes	Xi
Risk Phrases	R36/37/38:Irritating to eyes, respiratory system and skin . R43:May cause sensitization by skin contact.
Safety Phrases	S26-S36-S37/39
RIDADR	3261
WGK Germany	3
RTECS	GU1800000
Packaging Group	II
Hazard Class	8
HS Code	29144090

1,2-diethoxy-3,...

CAS#:389-27-5

Squaric acid

CAS#:2892-51-5

Literature: Cohen et al. Journal of the American Chemical Society, 1959 , vol. 81, p. 3480 Full Text View citing articles Show Details Park et al. Journal of the American Chemical Society, 1962 , vol. 84, p. 2919,2921

3-hydroxy-4-mor...

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Squaric acid

CAS#:2892-51-5

Literature: Paine, Anthony James Tetrahedron Letters, 1984 , vol. 25, # 2 p. 135 - 138

poly-silver(I) ...

CAS#:71226-39-6

Squaric acid

CAS#:2892-51-5

Literature: Islam, Nazar-ul; Sopher, David W.; Utley, James H. P. Tetrahedron, 1987 , vol. 43, # 5 p. 959 - 970

3,4-Di(tert-but...

CAS#:66478-66-8

Squaric acid

CAS#:2892-51-5

Literature: Bou; Pericas; Serratosa Tetrahedron Letters, 1982 , vol. 23, # 3 p. 361 - 364

2,4,4-trichloro...

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3-chloro-4-(mor...

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3-hydroxy-4-mor...

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Squaric acid

CAS#:2892-51-5

Literature: Paine, Anthony James Tetrahedron Letters, 1984 , vol. 25, # 2 p. 135 - 138

Precursor 5
CAS#:389-27-5 1,2-diethoxy-3,... CAS#:89846-88-8 3-hydroxy-4-mor... CAS#:71226-39-6 poly-silver(I) ... CAS#:66478-66-8 3,4-Di(tert-but...
CAS#:68239-28-1 2,4,4-trichloro...
DownStream 10
CAS#:14238-53-0 (4Z)-3-oxo-4-[(... CAS#:20389-20-2 Octahydroxycycl... CAS#:2892-63-9 3,4-Dichlorocyc... CAS#:23475-74-3 Quinolinium,1-e...
CAS#:2892-62-8 Dibutyl squarate CAS#:5231-87-8 Diethyl squarate CAS#:66478-66-8 3,4-Di(tert-but... CAS#:5222-73-1 Dimethyl squarate
CAS#:155338-39-9 3-hydroxy-4-(2-... CAS#:33512-89-9 3,4-dianilinocy...

HS Code	2914400090
Summary	2914400090 other ketone-alcohols and ketone-aldehydes。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0%

A fluorescence high throughput screening method for the detection of reactive electrophiles as potential skin sensitizers.

Toxicol. Appl. Pharmacol. 289 , 177-84, (2015)

Skin sensitization is an important toxicological end-point in the risk assessment of chemical allergens. Because of the complexity of the biological mechanisms associated with skin sensitization, inte...

Chiral squaramide derivatives are excellent hydrogen bond donor catalysts.

J. Am. Chem. Soc. 130(44) , 14416-7, (2008)

Thioureas represent the dominant platform for hydrogen bond promoted asymmetric catalysts. A large number of reactions, reported in scores of publications, have been successfully promoted by chiral th...

Strategies for optimizing the performance of carbazole thiophene appended unsymmetrical squaraine dyes for dye-sensitized solar cells.

Phys. Chem. Chem. Phys. 17 , 23095-103, (2015)

Unsymmetrical squaraine dyes (CTSQ-1 and CTSQ-2) with carbazole thiophene donor units were synthesized, characterized and used as sensitizers in dye-sensitized solar cells (DSSCs). These squaraines ex...

SQUARICACIDDIBUTYLESTERS

EINECS 220-761-4

Squaric acid

dihydroxy-cyclobutenedion

Quadratic acid

3,4-Dihydroxycyclobut-3-en-1,2-dion

1-Cyclobutene-3,4-dione-1,2-diol

3-Cyclobutene-1,2-dione, 3,4-dihydroxy-

2-dione

3,4-Dihydroxycyclobut-3-ene-1,2-dione

Squaric

DIKETOCYCLOBUTENEDIOL

dihydroxycyclobutenedione

MFCD00001334

3,4-Dihydroxy-3-cyclobutene-1,2-dione

SQUARC ACID

Shanghai Jizhi Biochemical Technology Co., Ltd
China
Product Name: Squaric acid
Price: ￥348.0/25g ￥118.0/5g
Purity: 98.0%
Stocking Period: 3 Day
Contact: Liu jia

Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: Squaric acid
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
Stocking Period: Inquiry
Contact: Ms Wang

Henan Tianfu Chemical Co., Ltd.
China
Product Name: 2892-51-5 3,4-Dihydroxy-3-cyclobutene-1,2-dione
Price: $Inquiry/1kg $Inquiry/25kg $Inquiry/1000kg $Inquiry/10ton
Purity: 99.0%
Stocking Period: Inquiry
Contact: Anson

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Squaric acid

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