GB352176A - Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride - Google Patents

Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride

Info

Publication number
GB352176A
GB352176A GB1579830A GB1579830A GB352176A GB 352176 A GB352176 A GB 352176A GB 1579830 A GB1579830 A GB 1579830A GB 1579830 A GB1579830 A GB 1579830A GB 352176 A GB352176 A GB 352176A
Authority
GB
United Kingdom
Prior art keywords
ether
diaceto
acetaldehyde
heated
zinc chloride
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1579830A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roche Diagnostics GmbH
Original Assignee
Boehringer Mannheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boehringer Mannheim GmbH filed Critical Boehringer Mannheim GmbH
Priority to GB1579830A priority Critical patent/GB352176A/en
Publication of GB352176A publication Critical patent/GB352176A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
    • C07C45/54—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition of compounds containing doubly bound oxygen atoms, e.g. esters
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54—Preparation of carboxylic acid anhydrides
    • C07C51/56—Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Acetic and other anhydrides, dichlor- and diaceto diethyl ether.-Aliphatic anhydrides are produced by heating diaceto-diethyl ether, CH3CH (O,CO,CH3)-O-CH (O,CO,CH3),CH3, or analogous bodies with a catalyst. Suitable catalysts are substances of acid or salt but not basic nature, such as hydrochloric and sulphuric acids, sulphur dioxide, and zinc and stannous chlorides. These ethers are produced by reacting with the aliphatic acid or its salt upon the corresponding dichlor ether, which is obtained by the reaction of hydrochloric acid on acetaldehyde or paraldehyde. In the examples, (1) the dichlor diethyl ether is allowed to stand at ordinary temperature with anhydrous alkali acetate; decahydronaphthalene and a small quantity of zinc chloride in acetone are added, and the acetaldehyde formed is distilled off; the acetic anhydride forms a layer separate from the decahydronaphthalene; (2) the dichlor ether is heated to 80 DEG C. with benzene and glacial acetic acid until the hydrochloric acid is expelled; the benzene is then distilled off and zinc chloride in acetone is added, when acetaldehyde distils off followed by acetic anhydride; (3) the diaceto ether is heated with zinc chloride in glacial acetic acid at 110-115 DEG C., acetaldehyde and acetic anhydride distilling off together; they are separated by fractional distillation; (4) the diaceto ether is heated with decahydronaphthalene and zinc chloride in alcohol; (5) the diaceto-ether is heated at 100-105 mm. pressure with zinc chloride in acetone; (6) the diaceto-ether is heated to 120 DEG C. and sulphur dioxide is passed in, acetaldehyde, paraldehyde, and acetic anhydride being distilled over; (7) the dipropio-ether is heated with zinc chloride in alcohol at 110 DEG C., propionic anhydride and acetaldehyde being distilled off.
GB1579830A 1930-05-22 1930-05-22 Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride Expired GB352176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1579830A GB352176A (en) 1930-05-22 1930-05-22 Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1579830A GB352176A (en) 1930-05-22 1930-05-22 Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride

Publications (1)

Publication Number Publication Date
GB352176A true GB352176A (en) 1931-07-09

Family

ID=10065654

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1579830A Expired GB352176A (en) 1930-05-22 1930-05-22 Process for the preparation of aliphatic acid anhydrides, specially of acetic anhydride

Country Status (1)

Country Link
GB (1) GB352176A (en)

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