CH183385A - Process for the preparation of a pyridine dye. - Google Patents
Process for the preparation of a pyridine dye.Info
- Publication number
- CH183385A CH183385A CH183385DA CH183385A CH 183385 A CH183385 A CH 183385A CH 183385D A CH183385D A CH 183385DA CH 183385 A CH183385 A CH 183385A
- Authority
- CH
- Switzerland
- Prior art keywords
- pyridine
- preparation
- quaternary pyridinium
- pyridinium compound
- treated
- Prior art date
Links
Description
Verfahren zur Darstellung eines Pyridinfarbstoffes. Gegenstand des vorliegenden Zusatz patentes ist ein Verfahren zur Darstellung eines Pyridinfarbstoffes, welches dadurch ge kennzeichnet ist, dass man 4'-Diäthylamino-y- phenylpyridin mit Benzylchlorid in die quaternäre Pyridiniumverbindung überführt und diese mit einem sulfonierenden Mittel behandelt.
<I>Beispiel:</I> 2,3 Gewichtsteile 4'-Diäthylamino-y-phe- nyl-pyridin werden in 10 Gewichtsteilen Al kohol suspendiert und nach Zugabe von 1,2 Gewichtsteilen Benzylchlorid 2 Stunden gekocht. Dann wird der Alkohol verdampft und der Rückstand aus etwa 50 Gewichts teilen Wasser unter Zugabe von wenig Tier kohle umkristallisiert. Man erhält rote Blätt chen, die 2 Mol Kristallwasser enthalten. Die getrocknete Substanz schmilzt bei \?83 C.
1 Gewichtsteil des so erhältlichen 4'-Di- äthylamino-y- phenylpyridin - chlorbenzylats wird mit 3 Gewichtsteilen konzentrierter Schwefelsäure übergossen, worauf sich stür misch Salzsäure entwickelt. Sobald diese nach gelassen hat, werden 3 Gewichtsteile rau chende Schwefelsäure (70% Anhydrid) zu gegeben und eine Stunde auf 100 C er wärmt. Das Gemisch wird nach dem Erkal ten auf Eis gegossen, bis zur beginnenden Trübung mit Natronlauge versetzt und dann die Sulfosäure durch Zugabe von Natrium acetat gefällt.
Die Sulfosäure wird aus 150 Gewichtsteilen Wasser umkristallisiert und in schmalen, langen, gelben Blättchen erhalten, die nach vorherigem Erwärmen bei etwa 240' C schmelzen. Die Sülfosäure färbt Acetatseide wie auch Wolle in grüngelben Tönen.
Process for the preparation of a pyridine dye. The subject of the present additional patent is a process for the preparation of a pyridine dye, which is characterized in that 4'-diethylamino-y-phenylpyridine is converted into the quaternary pyridinium compound with benzyl chloride and this is treated with a sulfonating agent.
<I> Example: </I> 2.3 parts by weight of 4'-diethylamino-y-phenyl-pyridine are suspended in 10 parts by weight of alcohol and, after adding 1.2 parts by weight of benzyl chloride, boiled for 2 hours. Then the alcohol is evaporated and the residue recrystallized from about 50 parts by weight of water with the addition of a little animal charcoal. Red leaves are obtained which contain 2 moles of water of crystallization. The dried substance melts at \? 83 C.
1 part by weight of the 4'-diethylamino-y-phenylpyridine - chlorobenzylate is poured over 3 parts by weight of concentrated sulfuric acid, whereupon hydrochloric acid develops rapidly. As soon as this has left, 3 parts by weight of fuming sulfuric acid (70% anhydride) are added and heated to 100 C for one hour. After cooling, the mixture is poured onto ice, sodium hydroxide solution is added until cloudiness begins, and the sulfonic acid is then precipitated by adding sodium acetate.
The sulfonic acid is recrystallized from 150 parts by weight of water and obtained in narrow, long, yellow flakes which melt at about 240 ° C. after prior heating. Sulphonic acid dyes acetate silk as well as wool in green-yellow tones.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE183385X | 1933-10-18 | ||
CH179453T | 1934-10-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH183385A true CH183385A (en) | 1936-03-31 |
Family
ID=25720315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH183385D CH183385A (en) | 1933-10-18 | 1934-10-16 | Process for the preparation of a pyridine dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH183385A (en) |
-
1934
- 1934-10-16 CH CH183385D patent/CH183385A/en unknown
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