What is acetic anhydride and the molecular weight of acetic anhydride

The loss of water from two acetic acid molecules is acetic anhydride, so it is called acetic anhydride.

Acetic anhydride is a colorless, transparent liquid. There is a strong smell of acetic acid. Sour taste.

It is hygroscopic. The refractive index is extremely high. Soluble in chloroform and ether, slowly soluble in water to form acetic acid.

Reacts with ethanol to form ethyl acetate. Relative density. Melting Point -73 .

Boiling point 139. Refractive index. Flash point 54.

Spontaneous ignition point. 400℃。Low toxicity, half lethal dose (rat, oral) 1780mg kg. Flammability. Corrosive. Do not touch** or eyes to prevent injury. It is tear-jerking.

Chinese name: acetic anhydride foreign name: acetic

Anhydride Synonyms: Acetic Anhydride, Acetic Anhydride, Anhydrous Acetic Acid Molecular Formula: C4H6O3 Relative Molecular Mass: Chemical Category: Acid Anhydride Control Type: Acetic Anhydride (Precursor Drug-2) Storage: Sealed and stored in a cool and dry manner.

The main production method of acetic anhydride is the reaction of acetic acid with ketone, which is prepared from acetone or acetic acid.

CH3CoCH3 + CH3CoOH ---CH2 = C = O, acetone is heated to 700 800 °, acetic acid is heated to 700 740 ° in the presence of ALPo4.

ch2=c=o+ch3cooh=ch3coococh3

Anhydride refers to the part left over by an oxygenated acid after removing one molecule of water or several molecules of water. Generally, inorganic acids are a molecule of the acid, and the direct loss of a molecule of water will form the anhydride of the acid, and the valence of the elements that determine the acidity in the anhydride remains unchanged.

Whereas, organic acids are formed by the dehydration reaction between two molecules of the acid or multiple molecules of the acid. Only oxygenated acids have anhydride. Anoxic acid is anhydride-free.

Anhydride is generally considered to be an oxide formed by the dehydration of an acid (anhydride of an organic acid is not an oxide).

The loss of water from two acetic acid molecules is acetic anhydride, so it is called acetic anhydride.

Acetic anhydride is a colorless, transparent liquid. There is a strong smell of acetic acid. Sour taste. It is hygroscopic. The refractive index is extremely high. Soluble in chloroform.

and ether, which slowly dissolves in water to form acetic acid. with ethanol.

action to form ethyl acetate.

Relative density melting point -73Boiling point 139. Refractive index flash point 54

Spontaneous ignition point 400Low toxicity, half lethal dose (rat, oral) 1780mg kg. Flammability.

Corrosive. Do not touch** or eyes to prevent injury. It is tear-jerking.

Chinese name: acetic anhydride foreign name: acetic anhydride alias: acetic anhydride, acetic anhydride, anhydrous acetic acid.

Molecular formula: C4H6O3

Relative Molecular Mass: Chemical Category: Anhydride Control Type: Acetic Anhydride (Precursor-2) Storage: Sealed and stored in a cool and dry manner.

The molecular weight of acetic anhydride is 102.9.

Colorless transparent liquid, with a strong acetic acid odor, sour taste, hygroscopic, soluble in chloroform and ether, slowly soluble in water to form acetic acid, and react with ethanol to form ethyl acetate. The relative density is not leaked 1.080g cm3, the melting point is -73, the boiling point is 139, the refractive index is 1.3904, the flash point is 49, and the ignition point is 400. Low toxicity, half lethal dose (rat, oral) 1780mg kg.

Flammable, corrosive, do not touch ** or eyes, in case of damage, tear gas.

It is flammable, and its vapor and air can form a first-class mixture, which can cause combustion in case of open flame and high heat energy. Chemical reactions can occur in contact with strong oxidizing agents. It can make alcohol, phenol, ammonia and amine form acetate and acetamide compounds respectively.

In the presence of Lewis acid, acetic anhydride can also cause acetylation of aromatic plum hydrocarbons or olefins. In the presence of sodium acetate, acetic anhydride undergoes a condensation reaction with benzaldehyde to form cinnamic acid. Rotten and slowly dissolved in water to acetic acid.

It reacts with alcohols to form acetate.

What it does:

Acetic anhydride is an important acetylation reagent, acetic anhydride is used in the manufacture of cellulose acetate, acetic acid plastics, non-combustible motion picture films; In the pharmaceutical industry, it is used to manufacture synthetic mycin, dysentery, dibazole, caffeine and aspirin, sulfonamide drugs, etc.; In the dye industry, it is mainly used for the production of dispersed dark blue HCl, dispersed red S-SWEL, dispersed yellow brown S-2rel, etc.

In the fragrance industry, it is used to produce coumarin, bornyl acetate, sunflower musk, cypress acetate, rosin acetate, phenylethyl acetate, geranil acetate, etc.; Acetyl peroxide, manufactured from acetic anhydride, is an initiator and bleaching agent for polymerization reactions.