Daiso Co., Ltd.

Daisco Co., Ltd

Masafumi Mikami

Yoshiro Furukawa

Junzo Otera

Yasushi Miki

Kazuhiro Kitaori

Tetsuyuki Saika

Makoto Hirata

Hiroyuki Kanesaki

Hiroshi Yoshimoto

Kousei Ikai

Kazumasa Hinoue

Takeshi Urano

Kimitaka Igi

Keisuke Yaegashi

Daisuke Fukumoto

Seiji Ohtaka

Naotaka Kameyama

Tetsuya Yanagimoto

An 1-amido-3-(2-hydroxyphenoxy)-2-propanol derivative represented by the following formula (1), wherein cycle A may have further 1 to 4 substituents, and said substituent means a substituent selected from the group consisting of saturated or unsaturated C1-4 alkyl group, aralkyl group in which alkyl moiety has 1 to 4 carbon atoms, aryl group, halogen atom, halogenated C1-4 alkyl group, C2-5 alkanoyl group, mono or dialkylcarbamoyl group in which alkyl moiety has 1 to 4 carbon atoms, cyano group and nitro group, and the substituents at positions 3 and 6, or at positions 4 and 5 on the cycle A are different each other. Other ring may be fused at positions 3 and 4, or at positions 5 and 6 on the cycle A to form a condensed polycyclic hydrocarbon with the cycle A. Ris alkanoyl group or aroyl group, and Ris hydrogen atom, alkanoyl group or aroyl group, or Rand Rmay be combined together with the N atom to form a cyclic imido group, which is useful as an intermediate of medicines, etc.

1-amido-3-(2-hydroxyphenoxy)-2-propanol derivatives and a process for preparing 2-amidomethyl-1,4-benzodioxane derivatives

A process for preparing 3-hydroxythiolane which is characterized in reacting a compound of the following formula, wherein X is halogen atom, and Ris substituted or unsubstituted alkyl group, substituted or unsubstituted aralkyl group, or substituted or unsubstituted aryl group, with a metal sulfide.

Process for preparing 3-hydroxythiolane

A process for preparing an amine which comprises in preparing an amine by decarboxylating an &#x3b1;-amino acid under heating in a high boiling liquid polymer having average molecular weight 200 to 6000, and directly recovering this amine by distillation in the same reaction system, namely in one pot.

Process for preparing amines

A method for preparing an aldehyde or ketone by oxidizing a primary or secondary alcohol in the presence of a nitroxyl radical compound and a co-oxidant in an organic solvent, which process is characterized in using an organic N-bromoamide compound or a combination of N-chlorosuccinimide and a compound having bromide ion as the co-oxidant.

Oxidation method of primary or secondary alcohol

A process for preparing a secondary alcohol which is characterized in adding a primary or a secondary amine in the reaction system in case that the secondary alcohol is prepared by hydrogenating in the presence of a noble metal, an epoxy derivative represented by the following formula, wherein Rand Rare the same or different, an organic group not containing aldehyde group or ketone group therein or hydrogen atom, provided that both Rand Rare not simultaneously hydrogen atom.

Process for preparing secondary alcohol

An object of the present invention is to provide a process wherein 1,2,4-butanetriol can be obtained safely, easily and inexpensively without causing problems concerning wastewater. A malic diester, 3-hydroxy-&#x3b3;-butyrolactone or 3,4-dihydroxybutanoate represented by the following formulae (I), or a mixture thereof is reduced with sodium borohydride in an organic solvent to give 1,2,4-butanetriol represented by the following formula (II). When an optically active substance is used as the above-mentioned starting compound, substantially no recemization occurs during the reduction, and optically active 1,2,4-butanetriol is obtained.

Process for preparing 1,2,4-butanetriol

Process for producing butanetriol derivative

Process for producing 1,2-propanediol

Process for preparation of glycidyl ether

Process for the preparation of 3-amino-2-hydroxy-1-propyl ethers

The present invention provides a cyclic sulfide compound represented by a general formula (I) ##STR1## (where R.sup.1 represents --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --O--CH.sub.2 --, --CH.sub.2 --O--, or --CH.sub.2 --S--). According to this invention, a novel cyclic sulfide compound which gives high refractive index and high Abbe number can be obtained. The polymerizable compositions for manufacturing optical products with this compound as their main component can be readily molded into plastic lenses which give superhigh refractive indices and high Abbe numbers or those which give high refractive indices and high Abbe number with low sp.grs. in addition thereto. The castings obtained from said polymerizable compositions are useful as plastic lenses for glasses, manifesting optical uniformity and being excellent in processability, transparency, and thermal, impact and light resistance. Further these polymerizable resin compositions are usable preferably as such optical products as prisms, optical fibers, optical disc substrates, color filters, or infrared absorption filters.

Cyclic sulfide compound, polymerizable compositions for optical products

The present invention provides a cyclic sulfide compound represented by a general formula (I) ##STR1## (where R.sup.1 represents --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --O--CH.sub.2 --, --CH.sub.2 --O--, or --CH.sub.2 --S--). Polymerizable compositions for manufacturing optical products with this compound as their main component can be readily molded into plastic lenses which give superhigh refractive indices and high Abbe numbers or those which give high refractive indices and high Abbe number with low sp.grs. in addition thereto. The castings obtained from said polymerizable compositions are useful as plastic lenses for glasses, manifesting optical uniformity and being excellent in processability, transparency, and thermal, impact and light resistance. Further these polymerizable resin compositions are usable preferably as such optical products as prisms, optical fibers, optical disc substrates, color filters, or infrared absorption filters.

Growing community of inventors

Osaka, Japan

Masafumi Mikami