CAS: 104-61-0; 5-Pentyldihydrofuran-2(3H)-One

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104-67-6 706-14-9 502-26-1

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2-庚酮置于氢氧化钾,Sodium Tetrahydroborate,溴,Sodium Acetate,尿素体系中,用 乙醇,N,N-二甲基甲酰胺 用作溶剂,化学反应 52.5H,反应生成γ-壬内酯
参考文献:Meldrum'S Acid As A Reagent For The Synthesis Of 4-Alkanolides
标题:Meldrum'S Acid As A Reagent For The Synthesis Of 4-Alkanolides
摘要:
Doi:10.1007/bf00955853

专利信息

专利号:EP-4092127-A1
优先权日:2021-05-18
标题:Enzyme-catalytic method for the direct stereoselective synthesis of gamma-(acyloxy) carboxylic acids
发明人：PARVE JAAN; KUDRJASHOVA MARINA; GATHERGOOD NICHOLAS; PARVE OMAR
权利人:TALLINN UNIV OF TECHNOLOGY
摘要:The present invention is a method for the stereoselective straightforward synthesis of gamma-acyloxy carboxylic acids of novel structure starting from racemic gamma-hydroxy carboxylic acid salts that are obtained by alkaline hydrolysis of the racemic gamma-lactones. The salt is acylated by enzyme catalysis in an organic solvent containing an acyl donor and an immobilised lipase, on stirring at room temperature (ca 20 °C) until reaching the conversion rate required. After that, the reaction mixture is acidified and extracted and the product treated with catalytic amount of para-toluenesulfonic acid in toluene during the time required for the relactonisation of the unreacted salt enantiomer. Thereafter, the target gamma-acyloxy carboxylic acid formed from one enantiomer of the starting compound and relactonised gamma-lactone formed from the other, unreacted enantiomer of the starting compound are isolated using a routine separation method, such as distillation, extraction with NaHCO3 water solution followed by acidification or column chromatography.

专利号:US-5103047-A
优先权日:1990-05-01
标题:Process for preparation of 4- and 5-ketocarboxylic acids
发明人：VISO MIGUEL; REID JACK R
权利人:LORILLARD TOBACCO CO
摘要:This invention is a novel synthesis of 4-and 5-ketocarboxylic acids which includes the reaction of the appropriate delta- or gamma-lactone with a chromosulfuric acid solution and separating the 4- or 5-ketocarboxylic acid product from the reduced solution.

专利号:US-5556924-A
优先权日:1993-11-01
标题 :Synthesis of photoreactive polymeric binders
发明人：FITZGERALD MAURICE J; KEARNEY FREDERICK R; LIANG RONG-CHANG; SCHWARZEL WILLIAM C
权利人:POLAROID CORP
摘要:A photoreactive binder that may be used to enhance photospeed in either conventional plates or on-press developable lithographic printing plates. Briefly, a polymer of m-isopropenyl- alpha , alpha -dimethylbenzyl isocyanate is derivatized for vinyl group reactivity by reacting the isocyanate groups thereof with hydroxyalkyl acrylate. The resulting photopolymeric binder provides significantly higher photospeed than the non-reactive binder currently utilized in the production of conventional printing plates. The resulting lithographic printing plate also shows better durability (as manifested by longer run-length) and is more easily developed by the microencapsulated developers utilized in the present invention. As to the preparation of the photoreactive binders, the application discloses a method of copolymerizing m-isopropenyl- alpha , alpha -dimethylbenzyl isocyanate (m-TMI) through complexation with an electron-deficient monomer such as maleic anhydride to accelerate free radical copolymerization with other monomers, and thus, provides greater monomer-to-polymer conversion. Use of the resulting product in the photoresist of a lithographic printing plate improves its adhesion to an underlying substrate.

专利号:CA-2731967-A1
优先权日:2008-08-15
标 题:Synthesis of cyclohexane derivatives useful as sensates in consumer products

专利号:US-2014186272-A1
优先权日:2008-08-15
标题:Synthesis of cyclohexane derivatives useful as sensates in consumer products

专利号:CN-102123982-B
优先权日:2008-08-15
标题:Synthesis of cyclohexane derivatives useful as sensates in consumer products