A process can be used for the synthesis of compounds containing at least one non-cyclic carbonate group, wherein a compound A) containing at least one five-membered cyclic monothiocarbonate group is reacted with at least one hydroxy group of a compound B) or of compound A) itself.

An embodiment relates to an aromatic polythiol compound for optical materials, and the aromatic polythiol compound according to the embodiment contains a phenyl group and a large number of sulfur atoms in its polythiol structure so that a polymerizable composition and an optical material obtained therefrom have excellent optical properties such as high refractive index and low specific gravity, as well as excellent mechanical properties such as low cure shrinkage; thus, they can be advantageously used for producing various plastic optical lenses such as eyeglass lenses and camera lenses.

An embodiment relates to an aromatic polythiol compound for optical materials, and the aromatic polythiol compound according to the embodiment contains a phenyl group and a large number of sulfur atoms in its polythiol structure so that a polymerizable composition and an optical material obtained therefrom have excellent optical properties such as high refractive index and low specific gravity, as well as excellent mechanical properties such as low cure shrinkage; thus, they can be advantageously used for producing various plastic optical lenses such as eyeglass lenses and camera lenses.

The present invention disclosed 3-substituted phenylamidine compounds of general formula (I), wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.4a, R.sup.4b, A and E have the same meanings as defined in description. The present invention further discloses methods for their preparation and use of the compounds of general formula (I) as a crop protection agent.

##STR00001##

The present invention disclosed 3-substituted phenylamidine compounds of general formula (I), wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.4a, R.sup.4b, A and E have the same meanings as defined in description. The present invention further discloses methods for their preparation and use of the compounds of general formula (I) as a crop protection agent.

##STR00001##

The present invention relates to a method for preparing methyl mercaptan, in batches or continuously, preferably continuously, said method including at least the following steps: a) reacting at least one hydrocarbon feedstock in the presence of hydrogen sulphide (H.sub.2S) and optionally sulphur (S) such as to form carbon disulphide (CS.sub.2) and hydrogen (H.sub.2); b) reacting said carbon disulphide (CS.sub.2) by hydrogenation in the presence of said hydrogen (H.sub.2) obtained in step a) such as to form methyl mercaptan (CH.sub.3SH), hydrogen sulphide (H.sub.2S) and possibly hydrogen (H.sub.2); c) optionally recirculating said hydrogen sulphide (H.sub.2S) formed during step b) to step a); and d) recovering the methyl mercaptan.

The present invention relates to a method for preparing methyl mercaptan, in batches or continuously, preferably continuously, said method including at least the following steps: a) reacting at least one hydrocarbon feedstock in the presence of hydrogen sulphide (H.sub.2S) and optionally sulphur (S) such as to form carbon disulphide (CS.sub.2) and hydrogen (H.sub.2); b) reacting said carbon disulphide (CS.sub.2) by hydrogenation in the presence of said hydrogen (H.sub.2) obtained in step a) such as to form methyl mercaptan (CH.sub.3SH), hydrogen sulphide (H.sub.2S) and possibly hydrogen (H.sub.2); c) optionally recirculating said hydrogen sulphide (H.sub.2S) formed during step b) to step a); and d) recovering the methyl mercaptan.

The present invention relates to a method for preparing methyl mercaptan, in batches or continuously, preferably continuously, said method including at least the following steps: a) reacting at least one hydrocarbon feedstock in the presence of hydrogen sulphide (H.sub.2S) and optionally sulphur (S) such as to form carbon disulphide (CS.sub.2) and hydrogen (H.sub.2); b) reacting said carbon disulphide (CS.sub.2) by hydrogenation in the presence of said hydrogen (H.sub.2) obtained in step a) such as to form methyl mercaptan (CH.sub.3SH), hydrogen sulphide (H.sub.2S) and possibly hydrogen (H.sub.2); c) optionally recirculating said hydrogen sulphide (H.sub.2S) formed during step b) to step a); and d) recovering the methyl mercaptan.

The present disclosure relates to a new type of vortioxetine analogue of Formula I or its polymorph or a solvate, a composition, and a kit comprising the analogue, the polymorph or the solvate, and the use of the compound or the polymorph or the solvate, or the composition in the preparation of a medicament for the treatment of depression. The methods of preparation of the analogues and intermediate compounds are also described.

##STR00001##

The present disclosure relates to a new type of vortioxetine analogue of Formula I or its polymorph or a solvate, a composition, and a kit comprising the analogue, the polymorph or the solvate, and the use of the compound or the polymorph or the solvate, or the composition in the preparation of a medicament for the treatment of depression. The methods of preparation of the analogues and intermediate compounds are also described.

##STR00001##