摘要:
The present invention is a method for producing a polyhydric phenol, including the following steps (a) to (d): (a) a first step of producing (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexcene-1-one from 2-deoxy-scyllo-inosose by a dehydration reaction; (b) a second step of producing 1,2,4-trihydroxybenzene from the (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one obtained in the first step by a dehydration reaction; (c) a third step of producing 4-hydroxycyclohexane-1,3-dione from the 1,2,4-trihydroxybenzene by a catalytic hydrogenation reaction with the use of a metal catalyst; and (d) a fourth step of producing hydroquinone by heating the 4-hydroxycyclohexane-1,3-dione.
摘要:
The present invention is a method for producing a polyhydric phenol, including the following steps (a) to (d): (a) a first step of producing (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexcene-1-one from 2-deoxy-scyllo-inosose by a dehydration reaction; (b) a second step of producing 1,2,4-trihydroxybenzene from the (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one obtained in the first step by a dehydration reaction; (c) a third step of producing 4-hydroxycyclohexane-1,3-dione from the 1,2,4-trihydroxybenzene by a catalytic hydrogenation reaction with the use of a metal catalyst; and (d) a fourth step of producing hydroquinone by heating the 4-hydroxycyclohexane-1,3-dione.
摘要:
Provided is a method for producing catechol in a one-pot by reacting (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one under hydrogen-reducing conditions while heating.
摘要:
Provided is a method for producing catechol in a one-pot by reacting (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one under hydrogen-reducing conditions while heating.
摘要:
A phosphazene-supported catalyst in which a support is bonded to a group represented by the general formula (1): wherein n, Zn−, a, b, c, d, R, R1 and D are all defined. The phosphazene-supported catalyst is highly effective to catalyze various organic reactions, and further has no reduction of activity even after recovery and reuse of the catalyst, thus it being economically advantageous. In addition, the polymerization of cyclic monomers, substitution of substituents, carbon-carbon bond forming reactions and the like can be conducted with extremely high efficiency.
摘要:
A phosphazene-supported catalyst in which a support is bonded to a group represented by the general formula (1): wherein n, Zn−, a, b, c, d, R, R1 and D are all defined. The phosphazene-supported catalyst is highly effective to catalyze various organic reactions, and further has no reduction of activity even after recovery and reuse of the catalyst, thus it being economically advantageous. In addition, the polymerization of cyclic monomers, substitution of substituents, carbon-carbon bond forming reactions and the like can be conducted with extremely high efficiency.
摘要:
A 3-aminomethyltetrahydrofuran derivative is produced by preparing a 3-cyanotetrahydrofuran derivative in a high yield from a malic acid derivative, and reducing the cyano group of the 3-cyanotetrahydrofuran derivative. The process can produce the 3-cyanotetrahydrofuran derivative in a high yield from inexpensive industrial materials.
摘要:
The compound [tris(dimethylamino)phosphonioamino]tris[tris(dimethylamino)phosphoranylideneamino]phosphonium dichloride can be prepared by contacting hydrogen chloride with tetrakis[tris(dimethylamino)phosphoranylideneamino]phosphonium chloride. The phosphonium dichloride compound can be used in a process wherein it is brought into contact with an OH−-form ion exchange resin to prepare tetrakis[tris(dimethylamino)phosphoranylideneamino]phosphonium hydroxide. Separate processes for separating or isolating the phosphonium chloride compound or isolating the phosphonium hydroxide compound from feed solutions wherein an extraction step is used are also set forth.
摘要:
An organic compound which is basic and soluble in an organic solvent, does not have a problem in preparation or handling and exhibits catalytic activity as a basic compound, i.e., a phosphine sulfide represented by formula (1), and a manufacturing process therefor, i.e., manufacturing a phosphine sulfide represented by formula (1), by reacting one molecule of thiophosphoryl chloride with three molecules of a phosphorane represented by formula (2). The phosphine sulfide can be used in a process for effectively manufacturing a poly(alkylene oxide) by polymerizing an alkylene oxide in the presence of the phosphine sulfide or of the phosphine sulfide and an active hydrogen compound selected from water and organic compounds having a partial structure of --OH or --NH--; and 2) a process for manufacturing a 1,2-dioxyethane derivative from an epoxy compound, i.e, manufacturing a 1,2-dioxyethane derivative by reacting an epoxy compound with a carboxylate, carboxylic anhydride, carbonate or phenol compound, respectively, in the presence of the phosphine sulfide.
摘要:
A process for preparing an organic compound, comprising conducting an organic reaction in the presence of a phosphine oxide represented by formula (1); ##STR1## where R.sup.1 is the same or different and each represents a hydrogen or hydrocarbon group with 1 to 10 carbon atoms, and x is the amount of water as a molar ratio which is 0 to 5.0, exhibiting a high catalytic performance especially in an organic reaction involving an alkylene oxide.