Sumitomo Chemical Company, Limited

Hiroyuki Suzuki

Shuhei Hashizume

Shigeru Okano

Nobuaki Kawamura

Yasuhiko Aoki

Hisao Akiyama

Naoki Harada

Tetsuya Miyamoto

Noriaki Yamauchi

Takemi Tokieda

Shigeru Kawabata

Isao Nakamae

Kazumi Yoshigoe

Iwao Minami

Koiti Ishii

Tatuo Miura

A granular reactive dye composition comprising a water-soluble reactive dye and at least one granulating auxiliary agent selected from the group consisting of compounds of the following formula (3), ##STR1## wherein R is --C.sub.s H.sub.2s+1, in which s is an integer of 5 to 20 and wherein the content of the granulating auxiliary agent is 5 parts by weight or less per 100 parts by weight of the reactive dye.

Granular reactive dye composition and production process thereof

A reactive dye composition containing a reactive dye and a salt of polyoxyethylene substituted-phenyl ether ester produces excellent solubility in water and in an aqueous alkali solution and can be used to dye a fiber material uniformly.

Reactive dye composition and method for dyeing or printing fiber

A new method for the production of intermediates in the synthesis of an optically active biotin, which comprises reacting a dicarboxylic acid of the formula: ##SPC1## Or its reactive derivative with an optically active primary amine, reducing the resulting trione with a metal hydride, hydrolyzing the resultant amide-alcohol and treating the thus produced lactone with a thiolactonating agent to give a thiolactone of the formula: ##SPC2## , the said trione and amide-alcohol being respectively novel and representable by the formulae: ##SPC3##

Method for synthesis of optically active thiolactones

In the conversion of a hexahydrofuro[3,4-d]-imidazole-2,4-dione compound into the corresponding hexahydrothieno[3,4-d]imidazole-2,4-dione compound, an improved process which comprises reacting the starting hexahydrofuro[3,4-d]imidazole-2,4-dione compound with a dithiocarbamate.

Process for preparing hexahydrothieno[3,4-d]imidazole-2,4-diones

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Habikino, Japan

Hiroyuki Suzuki