摘要:
The present invention relates to purification methods of pleuromutilin (I) by means of crystallisation and/or recrystallisation. The process according to the present invention is carried out in the presence of i-propylacetate.
摘要:
An improved method for the synthesis of substantially pure Permethrin having purity greater than 99.5% by Gas Chromatography provided. The embodiments also relates to a purification process of Permethrin by recrystallization from methanol-water mixture.
摘要:
Disclosed is a method of producing a compound which includes: obtaining a reaction product which contains a monoester compound represented by the following formula (I) and 1,4-cyclohexanedicarboxylic acid dichloride and/or 1,4-cyclohexanedicarboxylic acid, by reacting in an organic solvent a hydroxy compound represented by the formula Q-OH (where Q represents organic group which may have a substituent) with 1,4-cyclohexanedicarboxylic acid dichloride and/or 1,4-cyclohexanedicarboxylic acid; and mixing the reaction product with an acidic aqueous solution, where A represents hydroxyl group or chlorine atom and Q is as defined above.
摘要:
Provided is a crystalline form of chlorogenic acid. The crystalline form is an orthorhombic crystal system, the space group is P212121, the cell parameters are a=7.7291 (2) Å, b=10.9808 (2) Å, and c=3.5334 (7) Å, α=β=γ=90.00°, Z=8, and the cell volume is 3100.65 (11) Å3. Also provided is a preparation method for the crystalline form. The present crystalline form has good stability and does not significantly change during storage for 48 months in a cool, dark place, and the various indices all meet the relevant requirements for active pharmaceutical ingredients. The crystallization process provided by the present invention can not only use raw materials having different purities to prepare the same crystalline form of chlorogenic acid, but can also significantly reduce solvent residue in the raw materials, thereby improving product safety.
摘要:
The present invention provides a novel process for the purification of alpha-propargylhomoterephthalic acid dimethyl ester substantially free of homoterephthalic acid dimethyl ester. The present invention also provides a novel process for the purification of pralatrexate.
摘要:
The present invention relates to a novel crystalline form of ingenol mebutate, methods of preparation thereof, and to its use. More specifically, the invention relates to the conversion of amorphous ingenol mebutate (ingenol-3-angelate, PEP005) to a crystalline form, which was characterized by single crystal X-Ray crystallography (XRC), attenuated total reflectance Fourier transform infrared (FTIR-ATR) spectroscopy and Differential Scanning calorimetry (DSC).
摘要:
The present invention relates to a novel crystalline form of ingenol mebutate, methods of preparation thereof, and to its use. More specifically, the invention relates to the conversion of amorphous ingenol mebutate (ingenol-3-angelate, PEP005) to a crystalline form, which was characterized by single crystal X-Ray crystallography (XRC), attenuated total reflectance Fourier transform infrared (FTIR-ATR) spectroscopy and Differential Scanning calorimetry (DSC).
摘要:
A method of recovering pyrolysis products of resin of the present invention includes cooling gaseous pyrolysis products generated from pyrolysis of the resin in a pyrolysis tank to recover the resin as liquid pyrolysis products. The method includes the following steps (1) to (4): (1) continuously feeding fluidization gas, heated solid particles, and a resin into the pyrolysis tank to fluidize the solid particles and the resin by the fluidization gas; (2) continuously feeding the resin into the pyrolysis tank from a position which is ½ or less of the height of a solid particle layer in the pyrolysis tank in a stationary state; (3) continuously discharging the solid particles from a position lower than the height of a feeding position of the resin; and (4) heating the discharged solid particles in a heating furnace and then feeding the heated solid particles into the pyrolysis tank.
摘要:
Ketocarboxylic acids such as levulinic acid can be efficiently purified in high yield by esterification with a hydrocarbon polyol to the corresponding polyketocarboxylic ester, which can be readily purified, for example recrystallized. After purification, the ketocarboxylic ester can be hydrolyzed to provide pure ketocarboxylic acid, or a salt thereof, after removal of the esterifying hydrocarbon polyol, or used for other synthetic transformations. Advantageously, the polyketocarboxylic esters, ketocarboxylic acids, and salts thereof produced by this method are obtained in high purity.
摘要:
Provided is a curable composition for imprints excellent in pattern transferability. Disclosed is a curable composition for imprints comprising a polymerizable monomer (A) and a polymerization initiator (B), which is substantially free from a polymer which contains at least one species of the polymerizable monomer (A) as a repeating unit.