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623-68-7

Basic Information
CAS No.: 623-68-7
Name: Crotonic anhydride
Article Data: 24
Molecular Structure:
Molecular Structure of 623-68-7 (Crotonic anhydride)
Formula: C8H10O3
Molecular Weight: 154.166
Synonyms: 2-Butenoicacid, anhydride (9CI);Crotonic anhydride (6CI,7CI,8CI);2-Butenoic anhydride;Crotonic acid anhydride;NSC 97397;Crotonic Anhydride;
EINECS: 210-807-1
Density: 1.038 g/cm3
Melting Point: 72oC
Boiling Point: 247 °C at 760 mmHg
Flash Point: 106.1 °C
Hazard Symbols: CorrosiveC
Risk Codes: 34
Safety: 26-36/37/39-45
PSA: 43.37000
LogP: 1.20840
Synthetic route
107-93-7

(E)-but-2-enoic acid

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With 2-chloro-1,3-dimethylimidazolinium chloride; triethylamine In dichloromethane at 20℃; for 18h; Acylation;96%
With dicyclohexyl-carbodiimide
674-82-8

4-methyleneoxetan-2-one

3724-65-0

2-butenoic acid

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With 1,4-dioxane at 70 - 80℃; folgendes Destillieren des Reaktionsgemisches;
3724-65-0

2-butenoic acid

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With acetic anhydride
107-93-7

(E)-but-2-enoic acid

6443-91-0

ethynyl methyl ether

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With dichloromethane; mercury(II) oxide
10487-71-5

crotonyl chloride

121-44-8

triethylamine

71-43-2

benzene

623-68-7

trans-crotonic anhydride

60-29-7

diethyl ether

107-93-7

(E)-but-2-enoic acid

927-80-0

1-ethoxyacetylene

623-68-7

trans-crotonic anhydride

107-93-7

(E)-but-2-enoic acid

927-80-0

1-ethoxyacetylene

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With diethyl ether
123-73-9

crotonaldehyde

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With oxygen; cobalt(II) acetate; acetic acid at 30℃; unter leichtem Ueberdruck;
With oxygen; copper (I) acetate; acetic acid at 30℃; unter leichtem Ueberdruck;
With oxygen; manganese(II) acetate; acetic acid at 30℃; unter leichtem Ueberdruck;
With oxygen; acetic acid at 30℃; in Gegenwart einer Mischung von Wismut-,Kobalt- und Kupferpulver;
625-35-4, 3488-22-0, 10487-71-5

trans-chrotonyl chloride

crotonate of sodium

crotonate of sodium

623-68-7

trans-crotonic anhydride

sodium crotonate

sodium crotonate

623-68-7

trans-crotonic anhydride

Conditions
ConditionsYield
With thionyl chloride; Petroleum ether
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Chemistry

Chemistry informtion about Crotonic Anhydride (CAS NO.623-68-7) is:
IUPAC Name: [(E)-But-2-Enoyl] (E)-But-2-Enoate
Synonyms: 2-Butenoicacid,Anhydride ; Anhydridkyselinykrotonove ; Crotonicacidanhydride ; Crotonic Anhydride ; 2-Butenoic Anhydride ; Trans-2-Butenoic Anhydride ; 2-Butensureanhydrid ; Crotonsaeureanhydrid
Product Categories: Pharmaceutical Intermediates
MF: C8H10O3
MW: 154.16
EINECS: 210-807-1 
Density: 1.038 g/cm3
Flash Point: 106.1 °C
Boiling Point: 247 °C at 760 mmHg
Vapour Pressure: 0.0263 mmHg at 25°C 
Enthalpy of Vaporization: 48.41 kJ/mol
Refractive Index: n20/D 1.473(lit.)
Following is the molecular structure of Crotonic Anhydride (CAS NO.623-68-7) is:

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LD50 oral 2830mg/kg (2830mg/kg)   American Industrial Hygiene Association Journal. Vol. 23, Pg. 95, 1962.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Moderately toxic by ingestion. A skin irritant. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes:
CorrosiveC
Risk Statements:
R34:Causes burns.
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 3265 8/PG 3
WGK Germany: 3
RTECS: GQ6125000
HazardClass: 8
PackingGroup III

Specification

To protect yourself, you can put on faceshields, full-face respirator (US), gloves, goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter.