摘要:
A process for producing 5-halomethylfurfural represented by the formula, ##STR1## wherein X is Cl or Br, which comprises carrying out a acid-decomposition of saccharide in a water/organic solvent/magnesium halide system with hydrochloric acid, sulfuric acid, hydrogen chloride or other mineral acid in the presence or absence of surface active agent as a catalyst. The 5-halomethylfurfural is useful as an intermediate of medicines, agricultural chemicals, perfumes and the like.
摘要:
In a Reimer-Tiemann reaction for the preparation of a mixture of two hydroxybenzaldehydes (i.e., salicylaldehyde and p-hydroxybenzaldehyde) by reacting phenol with chloroform and an aqueous alkali solution in a heterogeneous system, the two hydroxybenzaldehydes can be prepared in a controlled formation ratio, yield and reaction rate depending upon the conditions used when the reaction is carried out in the presence of a phase transfer catalyst selected from the group consisting of a cationic type phase transfer catalyst, an amphoteric type phase transfer catalyst and an anionic type phase transfer catalyst.
摘要:
A method for producing an optically active 2,2-dimethylcyclopropanecarboxylic acid useful as an intermediate for dehydropeptidase I inhibitors, medicines and agricultural chemicals, which comprises reacting an optically active diphenylethylamine represented by the formula, ##STR1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom or a lower alkyl group, with 2,2-dimethylcyclopropanecarboxylic acid in a solvent to achieve the optical purification of said acid.
摘要:
The present invention relates to an optically active borane complex represented by the general formula, ##STR1## wherein R.sup.1 represents an aryl group, R.sup.2 represents an alkyl group and a mark * means an asymmetric carbon, and a method for producing optically active alcohol derivatives by the reduction of prochiral ketones with said borane complex. The optically active alcohol derivative is useful for fungicides, herbicides or plant growth regulators.
摘要:
In a Reimer-Tiemann reaction for the preparation of a mixture of salicylaldehyde and p-hydroxybenzaldehyde, improved yield of the product and high selectivity of salicylaldehyde can be obtained when an alkali metal salt of a phenol is reacted with a reaction mixture comprised of chloroform and a slurry of an alkali metal hydroxide (preferably, in a fine powder state thereof) and an inert organic solvent and optionally, a catalytic amount of a surfactant.
摘要:
The present invention relates to an asymmetrically modified borohydride type compound obtained by reacting an optically active amino alcohol represented by the formula, ##STR1## or its salt with an acid with a borohydride compound; its production method; and a method for producing an optically active alcohol derivative useful as fungicides, herbicides or plant growth regulators and represented by the formula, ##STR2## which comprises asymmetrically reducing a ketone compound represented by the formula, ##STR3## with the asymmetrically modified borohydride type compound.
摘要:
The present invention relates to an asymmetrically modified borohydride type compound obtained by reacting an optically active amino alcohol represented by the formula, ##STR1## or its salt with an acid with a borohydride compound; its production method; and a method for producing an optically active alcohol derivative useful as fungicides, herbicides or plant growth regulators and represented by the formula, ##STR2## which comprises asymmetrically reducing a ketone compound represented by the formula, ##STR3## with the asymmetrically modified borohydride type compound.
摘要:
The present invention relates to an optically active borane complex represented by the general formula, ##STR1## wherein R.sup.1 represents an aryl group, R.sup.2 represents an alkyl group and a mark * means an asymmetric carbon, and a method for producing optically active alcohol derivatives by the reduction of prochiral ketones with said borane complex. The optically active alcohol derivative is useful for fungicides, herbicides or plant growth regulators.
摘要:
There is disclosed an optically active salicylideneaminoalcohol compound of formula (1): wherein R1 represents an alkyl group or the like, R2 represents an aryl group and the like, and when X1 represents a nitro, X2 is a hydrogen atom, when X1 represents a chlorine atom, X2 is a chlorine atom, and when X1 is a hydrogen atom, X2 is a fluorine atom; and the carbon atom denoted by “*” is an asymmetric carbon atom having either an S or R configuration, and a chiral copper complex produced from the optically active salicylidenaminoalcohol compound and a copper compound.
摘要:
Disclosed is an asymmetric copper catalyst composition comprising, as components, (a) an optically active bisoxazoline compound of formula (1): wherein R1 and R2 are different and each represents a hydrogen atom, an alkyl group, a cycloalkyl group, or a phenyl or aralkyl group which may be substituted, R3 and R4 each represents a hydrogen atom, an alkyl group, a cycloalkyl group, or a phenyl or aralkyl group which may be substituted, or R3 and R4 may be bonded to each other to form a C3-5 cyclic alkylene group, R5 represents a hydrogen atom or a C1-6 alkyl group, or the two R5 groups may be bonded to each other to represent a C3-5 cyclic alkylene group, (b) a monovalent or divalent copper compound, and (c) a strong acid or a Lewis acid or a mixture thereof, and a process for producing an optically active cyclopropanecarboxylate using the same.