- Friedel - gram acylating reaction method based on phthalic anhydride and aromatic alkyl compound
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A part of a substituted alkylbenzene is used as a solvent and a reaction raw material for - gram acylating reaction, a part of a substituted alkylbenzene is dissolved in a reaction raw material phthalic anhydride and a chloroaluminate ionic liquid catalyst, and a residual part of a substituted alkylbenzene is added dropwise - to obtain - (2 - 4' - alkylbenzoyl) benzoic acid intermediate. 2 -position positioning selectivity of the method is higher, and the reaction production cost is low.
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Paragraph 0071-0073
(2021/09/08)
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- Preparation method of anthraquinone and alkyl derivatives thereof
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The invention relates to the field of organic matter preparation, and discloses a preparation method of anthraquinone and alkyl derivatives thereof, and the method comprises the following steps: underacidic conditions, carrying out contact reaction on anthracene and alkyl derivatives thereof, an oxidant and a catalyst. The anthraquinone and the alkyl derivative thereof have a structure as shown in a formula (I) which is described in the specification. The catalyst comprises a carrier and metal elements loaded on the carrier, wherein the metal elements comprise molybdenum and tungsten, in theformula (I), R1 and R2 are each independently selected from hydrogen and substituted or unsubstituted C1-C10 hydrocarbon groups. The method provided by the invention has the characteristics of mild operation conditions and high product yield.
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Paragraph 0139-0154
(2020/08/18)
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- PROCESS FOR PRODUCING SUBSTITUTED ANTHRAQUINONE
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A process for manufacturing a compound of formula (II), said process comprising a step of reacting a compound of formula (I) in the presence of a zeolite catalyst and a solvent, (I), (II) wherein R1, R2, R3, R4, R5, R6, R7 and R8 are independently H, halo, C1-C12 alkyl, C1-C12 alkyloxy, C2-C12 alkenyl, C2-C12 alkenyloxy, C2-C12 alkynyl, C2-C12 alkynyloxy, C3-C8 cycloalkyl, C3-C8 cycloalkyloxy, C6-C10 aryl, C6-C10 aryloxy, C7-C10 aralkyl, C7-C10 alkylaryl or C4-C7 heteroaryl; and wherein the solvent is a halogen substituted aromatic compound.
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Page/Page column 8-12
(2020/06/10)
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- Method for synthesizing 2-alkylanthraquinone
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The invention discloses a method for synthesizing 2-alkylanthraquinone. The method comprises the following steps: preparing a tert-butylanthraquinone intermediate BE acid from phthalic anhydride and alkylbenzene in the presence of a Lewis acid, carrying out dehydration ring closure by adopting a combined dehydrating agent composed of polyphosphoric acid and phosphorus pentoxide, pouring the obtained solution into ice water after the end of the ring closure I order to dilute the polyphosphoric acid to a certain concentration, adding xylene for extraction after water precipitation is finished, washing and concentrating the obtained extract to obtain a brown yellow block solid, and recrystallizing the solid to obtain the 2-alkylanthraquinone. The method of the invention the advantages of avoiding of using of fuming sulfuric acid and production of a large amount of dilute sulfuric acid in the phthalic anhydride method production process of anthraquinone, easily available raw materials, mild reaction conditions, easiness in application in industrial production, realization of continuous using of the byproduct phosphoric acid as the dehydrating agent after addition of phosphorus pentoxide, and good environmental protection meaning.
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Paragraph 0020; 0022
(2019/10/04)
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- 2-tert-amyl compounds
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Tert-amyl compounds of the general formula I STR1 and novel processes for preparing 2-tert-amylbutadiene by dehydrating 3,4,4-trimethylhex-1-en-3-ol at from 100° to 350° C. and from 0.01 to 50 bar on acidic catalysts, its preparation by partially hydrogenating 3,4,4-trimethyl-hex-1-yn-03-ol at from 0° to 50° C. and from 0.01 to 50 bar and its preparation by reacting tert-amyl methyl ketone (3,3-dimethylpentan-2-one) with acetylene in the presence of basic catalysts at from 0° to 60° C. and from 0.01 to 50 bar, and also the preparation of 2-tert-amylanthraquinone by reacting 2-tert-amylbutadiene with 1,4-naphthoquinone at from 20° to 200° C. and from 0.01 to 50 bar to give 2-tert-amyl-1,4,4a,9a-tetrahydroanthraquinone and then oxidizing the latter in the presence of a strong base at from 0° to 50° C. are described.
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- Process for preparation of 2-substituted 1,4-naphthoquinone
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A process for preparation of a 2-substituted-1,4-naphthoquinone which comprises oxidizing a 2-substituted naphthalene to obtain reaction products comprising a 2-substituted-1,4-naphthoquinone and a 6-substituted-1,4-naphthoquinone; adding a diene compound to the reaction products and heating the mixture to form a Diels-Alder reaction adduct between the diene compound and the 6-substituted-1,4-naphthoquinone in the reaction products; and separating the 2-substituted-1,4-naphthoquinone from the adduct.
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- Manufacture of alkylanthraquinones
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A process for preparing alkylanthrquinones wherein the alkyl group contains from 2 to 5 carbon atoms such as 2-ethylanthraquinone, 2-t-amylanthraquinone or 2-t-butylanthraquinone by ring closure from the corresponding alkylbenzoylvenzoic acid is disclosed. The process involves adding a solution of the alkylbenzoylbenzoic acid to 100% concentrated sulfuric acid or up to 12% oleum, distilling off the solvent at from 20° to 60° C., heating the remaining solution to from 80° to 95° C. and preferably from 83° to 87° C. for 3 to 5 hours, diluting the remaining reaction mixture with water and separating the alkylanthraquinone product.
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- Process for producing a 2-tertiary-alkyl substituted anthraquinones
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A process for producing a 2-tertiary-alkyl substituted anthraquinone, characterized by carrying out catalytic oxidation of a diphenylmethane type compound having the formula: STR1 wherein R1 and R2 are different from each other, and independently hydrogen or tertiary-alkyl having 4 or 5 carbon atoms with the proviso that one of R1 and R2 is hydrogen, and R3 is alkyl having 1-3 carbon atoms, in vapor phase in the presence of a catalyst containing vanadium and cerium is disclosed.
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- Process for producing a 2-tertiary-alkyl substituted anthraquinone
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A process for producing a 2-tertiary-alkyl substituted anthraquinone, characterized by carrying out catalytic oxidation of a diphenylmethane type compound having the formula STR1 wherein R1 and R2 are different from each other, and independently hydrogen or tertiary-alkyl having 4 and 5 carbon atoms with the proviso that one of R1 and R2 is hydrogen, and R3 is alkyl having 1-3 carbon atoms, in vapor phase in the presence of a catalyst comprising vanadium oxide is disclosed.
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