- manufacturing method of acetyl-triethyl citrate using solid acid catalysts
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The present invention relates to a method for producing acetyl triethyl citrate using a solid acid catalyst and, more specifically, to a method for producing acetyl triethyl citrate capable of increasing conversion rate of reactants while improving yield of acetyl triethyl citrate using zeolite as a catalyst. To this end, the method for producing the acetyl triethyl citrate comprises the following steps: an insertion step for inserting triethyl citrate and acetic anhydride into a reactor; and a reaction step for producing acetyl triethyl citrate by carrying out a reaction between triethyl citrate and acetic anhydride in the presence of the solid acid catalyst.COPYRIGHT KIPO 2017
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Paragraph 0044-0048; 0079
(2018/04/20)
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- 4-(N,N -dimethylamino)pyridine hydrochloride as a recyclable catalyst for acylation of inert alcohols: Substrate scope and reaction mechanism
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4-(N,N-Dimethylamino)pyridine hydrochloride (DMAP·HCl), a DMAP salt with the simplest structure, was used as a recyclable catalyst for the acylation of inert alcohols and phenols under base-free conditions. The reaction mechanism was investigated in detail for the first time; DMAP·HCl and the acylating reagent directly formed N-acyl-4-(N′,N′-dimethylamino) pyridine chloride, which was attacked by the nucleophilic substrate to form a transient intermediate that released the acylation product and regenerated the DMAP·HCl catalyst.
- Liu, Zhihui,Ma, Qiaoqiao,Liu, Yuxiu,Wang, Qingmin
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supporting information
p. 236 - 239
(2014/01/23)
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- SKIN EXTERNAL PREPARATIONS AND COSMETICS
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An object of the present invention is to provide skin external preparations and cosmetics which contain a branched acyl carnitine and have excellent formulation stability. A skin external preparation of the present invention includes a carnitine derivative represented by the following Formula (1) and/or a carnitine derivative salt represented by the following Formula (2), and an amphoteric surfactant. In Formula (1), R1 and R2 are each independently a C1-18 optionally branched, saturated or unsaturated aliphatic hydrocarbon group. In Formula (2), R1 and R2 are the same as in Formula (1), X? is a specific anion and Y+ is a specific cation.
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- Synthesis of 2-Oxo-2H-pyran-5-carboxylate Derivatives
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3-Substituted diethyl pent-2-enedioates are easily formylated by means of ethyl formate/TiCl4/4-methylmorpholine to produce the ethoxymethylene derivatives, which are smoothly cyclized either with HCOOH or PPA to the corresponding 2-oxo-2H-pyran-5-carboxylate derivatives.
- Kvita, Vratislav
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p. 411 - 416
(2007/10/02)
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