GB710201A - Improvements in or relating to new derivatives of pyridine aldehydes - Google Patents

Improvements in or relating to new derivatives of pyridine aldehydes

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Publication number
GB710201A
GB710201A GB3274/52A GB327452A GB710201A GB 710201 A GB710201 A GB 710201A GB 3274/52 A GB3274/52 A GB 3274/52A GB 327452 A GB327452 A GB 327452A GB 710201 A GB710201 A GB 710201A
Authority
GB
United Kingdom
Prior art keywords
pyridine
aldehydes
addition
sulphur dioxide
compounds
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
GB3274/52A
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.)
Dr F Raschig GmbH
Original Assignee
Dr F Raschig 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 Dr F Raschig GmbH filed Critical Dr F Raschig GmbH
Publication of GB710201A publication Critical patent/GB710201A/en
Expired legal-status Critical Current

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Abstract

The invention comprises addition compounds of pyridine aldehydes, of typical formula <FORM:0710201/IV (b)/1> prepared by treatment of pyridine aldehydes or mixtures of the same with sulphur dioxide and water, when the sparingly soluble addition compounds separate. Acid salts or weakly acid solutions of the aldehydes may be treated likewise. The addition compounds can also be prepared by treatment of the corresponding alkali bisulphite compounds with dilute mineral or organic acids, e.g. citric or acetic acid. The above reactions may be conducted in organic solvents, e.g. alcohol, benzene, provided at least one molecule of water is present. In examples: (1) a mixture of b -, g - and a 1-methyl-a -pyridine aldehydes in 90 per cent aqueous solution is treated with sulphur dioxide, when the addition compounds separate. Other examples are given, treating a -pyridine aldehyde, its hydrochloride, or g -pyridine aldehyde in aqueous alcoholic or benzolic solution with sulphur dioxide; and treating the sodium bisulphite addition compound of b -pyridine aldehyde with 5N sulphuric acid, the required addition product separating from solution in all cases. Specification 710,192 is referred to.
GB3274/52A 1951-03-12 1952-02-07 Improvements in or relating to new derivatives of pyridine aldehydes Expired GB710201A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE710201X 1951-03-12

Publications (1)

Publication Number Publication Date
GB710201A true GB710201A (en) 1954-06-09

Family

ID=6618333

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3274/52A Expired GB710201A (en) 1951-03-12 1952-02-07 Improvements in or relating to new derivatives of pyridine aldehydes

Country Status (1)

Country Link
GB (1) GB710201A (en)

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