Abstract: The present invention provides a process for preparing optically active azetidine-2-carboxylic acids using readily available reagents of relatively low price in the industry. Thus, there is provided optically active azetidine-2-carboxylic acid, and a process for producing the same by subjecting optically active N-(alkylbenzyl)azetidine-2-carboxylic acid represented by the formula (1): ##STR1## to hydrogenolysis in the presence of a catalyst.

Abstract: A method for producing a propargylamine compound represented by the general formula (I): ##STR1## which comprises reacting a propargyl compound represented by the general formula (II): ##STR2## with an aromatic aldehyde represented by the general formula (III):ArCHO (III)and ammonia to obtain an imine compound represented by the general formula (IV): ##STR3## and hydrolyzing the resultant imine compound. It is to provide a method for producing a propargylamine compound from a propargyl compound by a simple operation without using a special facility, using ammonia as a reaction reagent, without producing a dipropatygylamine compound and a tripropargylamine compound as by-products.

Abstract: A process for producing an aminonitropyridine represented by the general formula [1], which comprises reacting a nitropyridine represented by the general formula [2] (wherein X.sup.1, X.sup.2 and X.sup.3 indicate a hydrogen atom, a halogen atom, a nitro group, a cyano group, an aryl group, an aromatic heterocycle or an alkyl group, etc.; Y is an oxygen atom; and n is 0 or 1) with an O-substituted hydroxylamine represented by the general formula [3] (wherein R.sup.4 is a hydrogen atom, an alkyl group, a cycloalkyl group or an aralkyl group; and R.sup.5 is an alkyl group or an aralkyl group) or a salt thereof in the presence of a base and a metal catalyst.

Abstract: Disclosed is a process for producing .beta.-nitroenamine represented by the formula I: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and independently indicate a hydrogen atom or a C.sub.1 -C.sub.10 alkyl group which may be optionally substituted with at least one group selected from the group consisting of a halogen atom, a lower alkoxy group, an aryloxy group, a hydroxyl group or an aryl group, or an aryl group which may be optionally substituted with a halogen atom, a lower alkyl group, a lower alkoxy group, an aryl group, an aryloxy group, a nitro group, a cyano group, an acylamino group, a di-lower alkylamino group, an arylamino group, a hydroxyl group, an arylsulfonyl group, a mercapto group, a lower alkylthio group or an arylthio group, R.sub.1 and R.sub.2 may bond together to form a cycloalkyl or bicycloalkyl and R.sub.3 is a hydrogen atom, a lower alkyl group, a cycloalkyl group or an aralkyl group; and an intermediate for producing the .beta.-nitroenamine.

Abstract: Disclosed is a process for producing .beta.-nitroenamine represented by the formula I: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and independently indicate a hydrogen atom or a C.sub.1 -C.sub.10 alkyl group which may be optionally substituted with at least one group selected from the group consisting of a halogen atom, a lower alkoxy group, an aryloxy group, a hydroxyl group or an aryl group, or an aryl group which may be optionally substituted with a halogen atom, a lower alkyl group, a lower alkoxy group, an aryl group, an aryloxy group, a nitro group, a cyano group, an acylamino group, a di-lower alkylamino group, an arylamino group, a hydroxyl group, an arylsulfonyl group, a mercapto group, a lower alkylthio group or an arylthio group, R.sub.1 and R.sub.2 may bond together to form a cycloalkyl or bicycloalkyl and R.sub.3 is a hydrogen atom, a lower alkyl group, a cycloalkyl group or an aralkyl group; and an intermediate for producing the .beta.-nitroenamine.

Abstract: A process for preparing a nitroaniline derivative comprising a step of reacting an aromatic nitro compound with an O-alkylhydroxylamine or a salt thereof in the presence of a base and optionally a metallic catalyst, which process is industrially advantageous since it provides the nitroaniline derivative from the aromatic nitro compound in a high yield in one step, and the aminating agent used can be obtained from hydroxylamine at a relatively low cost.

Abstract: There is disclosed a process for the production of 2-thiophene aldehydes, in which the 2-thiophene aldehydes are obtained by the formylation of thiophene or derivatives thereof with formamides and phosgene.