摘要:
PROBLEM TO BE SOLVED: To provide an improved method for producing high-purity halogen-free o-phthalaldehyde. SOLUTION: This method for producing the high-purity halogen-free o-phthalaldehyde comprises (a) hydrolyzing a tetrahalo-o-xylene at a temperature of 155-160°C and a pressure of 2-5 bar and, when necessary, in the presence of a phase transition catalyst, so as to form o-phthalaldehyde, then (b) converting the o-phthalaldehyde into a dialkoxyphthalan corresponding thereto in an acidic alcohol solvent having a temperature of 0°C to a reflux temperature, and further (c) acetalizing the dialkoxyphthalan by acidic hydrolysis at a pH of more than 1.5 to a pH of 7. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an extensive novel solid phase which has characteristics like a melting point, solubility, dissolution rate, chemical stability, thermodynamic stability, and/or bioavailability which are different from an existing solid aspect of a basic pharmaceutical molecule. SOLUTION: The multiple-component phase composition comprises a solid phase which is maintained by an intermolecular interaction between two or more independent molecular entities, wherein at least one of two or more independent molecular entities is a pharmaceutical molecule. Moreover, a method for identifying complementary chemical functionalities to form a desired supramolecular synthon is disclosed. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an improved method for purifying crude o- phthalaldehyde(OPA) that can simply and safely purify crude o-phthalaldehyde substantially quantitatively and give extremely stabilized o-phthalaldehyde causing no agglomeration even after a lapse of years. SOLUTION: Relating to improved method for purifying and pharmaceutically preparing o-phthalaldehyde, the crude OPA given by acidic hydrolysis of OPA acetal, if necessary, adding basic aqueous solution to adjust the pH to 1-8, then the phase separation is carried out. The water in the aldehyde-including phase is distilled off in a thin layer evaporator under very short thermal stress of