- Method for preparation of cyclic myrac aldehydes from myrac aldehyde catalyzed by zinc-containing ionic liquid
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The invention provides a novel method for catalyzing cyclization reaction of myrac aldehyde for conversion to cyclic myrac aldehydes by using a Lewis acidic ionic liquid as a catalyst. According to the method, by using a zinc-containing ionic liquid as a catalyst and under the mild condition, 4-(4-methyl-3-pentenyl)-3-cyclohexenal(p-myrac aldehyde) and 3-(4-methyl-3-pentenyl)-3-cyclohexenal (m-myrac aldehyde) undergo selective cyclization to prepare cyclic myrac aldehydes (1,2,3,4,5,6,7,8-octahydro-,8,8-dimethyl-2-naphthaldehyde and 1,2,3,4,5,6,7,8-octahydro-5,5-dimethyl-2-naphthaldehyde). Incomparison with a traditional cyclic myrac aldehydes production method, the invention has the following distinctive characteristics: the use of a volatile organic solvent is avoided in the reaction; the reaction condition is mild; the target product has high selectivity, and the reaction is rapid; after the reaction, the ionic liquid catalyst and the product are automatically layered and are convenient to separate; the ionic liquid catalyst is recyclable; generation of a waste acid solution by traditional catalysis is avoided; and the method is environmentally friendly.
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Paragraph 0023-0025; 0027-0030; 0040-0042
(2019/04/30)
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- Method of selective cyclization of myrac aldehyde catalyzed by supported tungsten carbide for preparation of cyclic myrac aldehydes
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The invention relates to a cyclization reaction of myrac aldehyde catalyzed by tungsten carbide, specifically to a method of selective cyclization of myrac aldehyde catalyzed by supported tungsten carbide for preparation of cyclic myrac aldehydes. According to the method, para-/meta- myrac aldehyde is used as a raw material to undergo a highly selective reaction in an organic solvent at 50-150 DEGC to generate cyclic myrac aldehydes 1,2,3,4,5,6,7,8-octahydro-,8,8-dimethyl-2-naphthaldehyde and 1,2,3,4,5,6,7,8-octahydro-5,5-dimethyl-2-naphthaldehyde. The conversion rate of the substrate reachesup to 100%, and yield of the target product reaches up to 99%. Compared with the conventional catalytic route, the supported non-noble metal tungsten carbide is used as a catalyst without the use ofinorganic acid or alkali in the invention, thus avoiding generation of a large amount of acid liquor by traditional catalysis. The invention has the following characteristics: the reaction condition is mild; the catalyst is cheap and recyclable and has high activity and selectivity; and the reaction process is environmentally-friendly.
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Paragraph 0022-0031; 0036-0045
(2019/04/30)
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- A catalytic citrus reticulata blue aldehyde supported upper collector [...] method of preparation (by machine translation)
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The invention provides a to Re2 O7 /AC as catalyst, the catalytic [...][...] reaction conversion for the new method. The method to the organic small molecule reagent as reaction solvent, in order to Re2 O7 /AC as catalyst, under mild conditions will be 4 - (4 - methyl - 3 - pentenyl) - 3 - ring hexenal (citrus reticulata blue aldehyde to position) and 3 - (4 - methyl - 3 - pentenyl) - 3 - ring hexenal (meta-citrus reticulata blue aldehyde) selection cyclized preparation [...] (1, 2, 3, 4, 5, 6, 7, 8 - octahydro -, 8, 8 - dimethyl - 2 - [...] and 1, 2, 3, 4, 5, 6, 7, 8 - octahydro - 5, 5 - dimethyl - 2 - [...]). Compared with the traditional [...] production method, the invention feature: mild reaction conditions, selectivity of target product is high, the reaction speed is fast; the catalyst is activated carbon load of the upper collector, can be recycled, thereby avoiding the generation of traditional catalytic waste acid, environment-friendly. (by machine translation)
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Paragraph 0021-0024; 0031-0036
(2019/04/30)
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- Method used for preparation of cyclized myrac aldehyde through catalytic selective cyclization of myrac aldehyde with supported molybdenum carbide
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The invention relates to molybdenum carbide catalyzed myrac aldehyde cyclisation reaction, and more specifically relates to a method used for preparation of cyclized myrac aldehydes (1, 2, 3, 4, 5, 6,7, 8-octahydro-, 8, 8-dimethyl-2-naphthaldehyde and 1, 2, 3, 4, 5, 6, 7, 8-octahydro-5, 5-dimethyl-2-naphthaldehyde) through catalytic selective cyclization of myrac aldehydes (4-(4-methyl-3-pentenyl)-3-cyclohexene aldehyde (p-myrac aldehyde) and 3-(4-methyl-3-pentenyl)-3-cyclohexene aldehyde (m-myrac aldehyde)) with a supported molybdenum carbide catalyst under relatively mild conditions. According to the method, p-myrac aldehyde is taken as a raw material, in an organic solvent, at room temperature, production of 1, 2, 3, 4, 5, 6, 7, 8-octahydro-, 8, 8-dimethyl-2-naphthaldehyde through highselective cyclization reaction is realized; the highest substrate conversion rate is 100%, and the highest target product yield is 99%. Compared with conventional catalytic route, supported non-precious metal molybdenum carbide is taken as a catalyst, water is taken as reaction solvent, using of inorganic acid or base is not needed, and generation of a large amount of acid solution in conventional catalytic method is avoided; reaction conditions are mild, the catalyst is cheap, is high in activity and selectivity, and can be recycled, and the reaction process is friendly to the environment.
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Paragraph 0021-0033; 0038-0042
(2019/07/04)
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- Precursors for fragrant ketones and fragrant aldehydes
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The present invention refers to fragrance precursors of formula I for a fragrant ketone of formula II and one or more fragrant aldehydes or ketones of formula III and IV, These fragrance precursors are useful in perfumery, especially in the fine and functional perfumery.
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- CYCLIZATION OF DERIVATIVES OF 1-(4-METHYL-3-PENTENYL)-1-CYCLOHEXENE AT ELEVATED TEMPERATURES
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With catalytic amounts of an acid and at elevated temperatures the derivatives of 1-(4-methyl-3-pentenyl)-1-cyclohexene undergo electrophilic cyclization with high yields.
- Kron, A. A.,Burdin, E. A.,Fedotova, Z. M.,Novikov, N. A.
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p. 1035 - 1038
(2007/10/02)
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