Abstract: The invention relates to a process for the preparation of an ?-benzyl ester of an amino diacid, characterized in that the amino diacid is reacted with a benzyl alcohol derivative of formula (I) in which the R1 substituent or substituents, which are identical or different, represent a hydrogen atom, a C1 to C4 alkyl group, a C1 to C4 alkoxy group or a halogen atom and n is equal to 1, 2 or 3, in the presence of at least one mol per mole of the amino diacid of an alkanesulphonic acid, optionally in the presence of a solvent. The intermediate alkanesulphonates of the ?-benzyl esters of amino diacids and the ?-benzyl esters of amino diacids are obtained with a good yield and an excellent purity by virtue of this process.

Abstract: The invention relates to a process for the preparation of an &ohgr;-benzyl ester of an amino diacid, characterized in that the amino diacid is reacted with a benzyl alcohol derivative of formula (I) 1

Abstract: The invention relates to a process for the preparation of N,N′-carbonylbislactams by reaction of phosgene with at least one lactam which is characterized in that the tertiary amine is chosen from the group consisting of non-nucleophilic aliphatic tertiary amines. N,N′-Carbonylbislactams of high purity are thus obtained with good yields, both in the laboratory and on the industrial scale.

Abstract: The disclosure relates to a process for the synthesis of substituted or unsubstituted aliphatic, cycloaliphatic or araliphatic chloroformates by reaction of the corresponding alcohol with phosgene, diphosgene and/or triphosgene. The reaction is carried out under a pressure of between 15×103 Pa and 85×103 Pa and at a temperature of between −30° C. and +50° C. The process is particularly well suited to the preparation of menthyl chloroformate and benzyl chloroformate.

Abstract: The invention relates to a process for the synthesis of substituted or unsubstituted aliphatic, cycloaliphatic or araliphatic chloroformates by reaction of the corresponding alcohol with phosgene, diphosgene and/or triphosgene. The reaction is carried out under a pressure of less than or equal to 95×103 Pa, i.e. 950 mbar, and at a temperature of between −30° C. and +50° C.

Abstract: The invention relates to a process for the preparation of N,N′-carbonylbislactams by reaction of phosgene with at least one lactam which is characterized in that the tertiary amine is chosen from the group consisting of non-nucleophilic aliphatic tertiary amines.

Abstract: The invention relates to a process for preparing carboxamide oximes of the formula (I): in which R.sup.1 represents an aryl or heteroaromatic group, and R.sup.2 and R.sup.3 represent a hydrogen atom or groups as defined in the description, characterized by the three following steps:1) An amide of the formula (II) R.sup.1 CONHR.sup.4, with R.sup.1 having the previous meaning and R.sup.4 being a C.sub.1 to C.sub.8 alkyl group, is reacted with a chlorinating agent in order to obtain the corresponding chloroimine,2) The resulting chloroimine is then caused to react with an aminopyrazole in order to obtain a novel disubstituted amidine,3) The resulting amidine is caused to react with hydroxylamine or one of its salts.Carboxamide oximes are prepared more rapidly, and in a good yield, in this way. They are useful as synthesis intermediates, in particular for preparing photographic developing agents.