IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0782682
(1977-03-30)
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우선권정보 |
CH-0004534 (1976-04-09) |
발명자
/ 주소 |
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출원인 / 주소 |
- Ciba-Geigy Corporation (Ardsley NY 02)
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인용정보 |
피인용 횟수 :
13 인용 특허 :
0 |
초록
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There is described a process for the production of maleimides, particularly N-substituted maleimides or N,N′-bis-maleimides, by isomerization of the corresponding isoimides in the presence of specific catalysts, such as mixtures of phenol and triethylamine. Maleimides of high purity and in good to v
There is described a process for the production of maleimides, particularly N-substituted maleimides or N,N′-bis-maleimides, by isomerization of the corresponding isoimides in the presence of specific catalysts, such as mixtures of phenol and triethylamine. Maleimides of high purity and in good to very good yields under mild conditions and with the use of small amounts of catalyst are obtained by the process according to the invention.
대표청구항
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Process for the production of an imide of the formula I [Figure] (I) wherein n represents the number 1 or 2, Q represents, if n is 1, phenyl, 1-naphthyl, 2-naphtyl, or said phenyl or said naphthyl groups substituted by 1 to 3 moieties selected from the group consisting of halogen, hydroxyl, alkyl o
Process for the production of an imide of the formula I [Figure] (I) wherein n represents the number 1 or 2, Q represents, if n is 1, phenyl, 1-naphthyl, 2-naphtyl, or said phenyl or said naphthyl groups substituted by 1 to 3 moieties selected from the group consisting of halogen, hydroxyl, alkyl of 1 to 8 carbon atoms, halogenoalkyl of 1 to 3 carbon atoms, alkylthio of 1 to 4 carbon atoms, N,N-dialkylamino of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, phenoxy, alkoxycarbonyl of 2 to 5 carbon atoms; -SO2Y, -NHCOY, [Figure] where Y is phenyl or alkyl of 1 to 4 carbon atoms, Y1 is hydrogen, phenyl, naphthyl or alkyl of 1 to 8 carbon atoms and Y2 is hydrogen or alkyl of 1 to 8 carbon atoms; cyano and nitro; and, if n is 2, Q represents 1,3-phenylene, 1,4-phenylene 1,2-naphthylene, 1,8-naphthylene or 2,3-naphthylene; or said phenylene or naphthylene substituted by 1 to 3 moieties selected from the group given for substituting phenyl or naphthyl for Q when n is 1; or a group of the formulae [Figure] whereby X represents the bridge member -O-, -S-, -S-S-, -SO2-, -CH2-, -CO-or [Figure] which process comprises converting an isoimide of the formula II [Figure] (II), wherein Q and n have the meanings given under the formula I, in the presence of a compound of the formula III M-OH)z (III) and of a teriary amine of the formula IV or V [Figure] wherein z represents the number 1 or 2, m represents an integer from 2 to 6, M represents, where z is 1, phenyl, naphthyl or said phenyl substituted by 1 to 3 moieties selected from the group consisting of nitro, hydroxyl, alkyl of 1 to 4 carbon atoms and halogen, or a group [Figure] where z is 2, a group [Figure] R1 and R2 independently of one another represent an alkyl group having 1 to 16 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or benzyl, R3 represents an alkyl group having 1 to 16 carbon atoms, phenyl, benzyl or phenylethyl, and R4 represents methyl or ethyl, at a temperature of about 0-80°C., to an imide of the formula I, and wherein the compound of formula III and the tertiary amine of formula IV or V are each used in amount of 0.2 to 10 mol %, relative to the isoimide of formula II. Process according to claim 4 wherein Q represents the 4,4′-diphenylmethane group.
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