- Method for preparing ambrotone
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The invention relates to a method for preparing ambrotone. The method includes steps of 1, synthesizing 3-methyl-3-pentene-2-ketone; 2, carrying out diene addition for preparing ambrotone intermediates; 3, carrying out cyclization reaction to prepare the ambrotone. Diene addition for preparing the ambrotone intermediates is carried out without catalysts by the aid of high-temperature gas-phase reaction. The method has the advantages that the ambrotone is prepared from raw materials beta-pinene, butanone and acetaldehyde, other organic solvents are omitted, high-pollution and high-carcinogenesis substances such as benzene and toluene are omitted, accordingly, the cost can be lowered, the quality of products can be effectively improved, the application range of the products can be effectively expanded, and Diels-Alder condensation reaction is carried out by the aid of the high-temperature gas-phase reaction; the Diels-Alder condensation reaction is carried out by the aid of the high-temperature gas-phase reaction or atomized small-molecule water drop and gas phases, catalysts such as Lewis acid or proton acid are omitted at reaction steps, accordingly, the production cost can be lowered, technological equipment can be simplified, post-reaction treatment working procedures can be shortened, and the purpose of zero sewage discharge can be truly achieved.
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Paragraph 0080; 0083; 0086; 0089; 0090; 0093; 0094
(2017/09/12)
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- Preparation method of ambrotone for improving fragrance quality of ambergris
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The invention provides a preparation method of ambrotone for improving fragrance quality of ambergris. The method comprises the following steps: (1) 3-methyl-3-penten-2-ketone is synthesized; (2) an intermediate product cyclic ketone is obtained by a Diels-Alder reaction; (3) a cyclization reaction is carried out, wherein a certain amount of strong acids and lower alcohol solvents are added into a reaction vessel, the raw material intermediate product cyclic ketone is added drop by drop at a certain temperature, the reaction is carried with stirring for 5-10 hour, and the product ambrotone is obtained. Compared with the prior art, the method is advantageous in that content of an ambargris fragrance compound 1-(1,2,3,4,5,6,7,8a-octahydro-1,2,8,8-tetramethyl-2-acetonaphthone) with lower fragrance threshold value is increased from 2% to 5% or above, finally ambargris fragrance of the ambrotone product is improved; nearly no pollution generates in the production process, the yield is high, and the method is suitable for industrial production.
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Paragraph 0029; 0030
(2016/12/16)
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- PERFUME COMPOSITIONS
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Perfume ingredients have been investigated and classified for their effectiveness in detaching biofilms from surfaces. Based on this classification, perfume compositions that are effective in assisting biofilm detachment can be formulated, whilst also allowing a degree of freedom in formulation that permits consideration of the hedonic properties of the composition. The compositions can be used in a wide range of perfumed consumer products, such as personal, domestic and industrial products, e.g. hard surface cleaning products, dental care products, and deodorant products.
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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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