Sumitomo Chemical Company, Limited

Mitsubishi Hitachi Power Systems, Ltd.

Atsunori Mori

Shohei Inoue

Hiroshi Sato

Kensuke Futahashi

Keisuke Matsuyama

Katsuhisa Hamada

Tomoyuki Onishi

Takumi Matsumura

Yoshitaka Ikeda

Tomoshige Takata

Toshinari Nishimura

Shoichi Okawara

Tomoshi Yamasaki

Koichi Kinoshita

Provided is a steam valve () equipped with: a stop valve () capable of stopping/releasing the flow of steam when driven so as to open/close; an governing valve () that is provided coaxially in the interior of the stop valve (), and that controls the flow volume of the steam when driven to open/close in the same direction as the opening/closing of the stop valve (); and a first guide part () that is provided between the stop valve () and the governing valve () so as to separate the stop valve and the governing valve in the radial direction, and that guides at least the governing valve in the opening/closing direction.

Steam valve and steam turbine

(S)-cyanohydrins are produced by asymmetric addition of hydrogen cyanide to aldehydes in the presence of a catalyst of cyclo-&lsqb;(S)-leucyl-(S)-histidyl&rsqb;.

Catalyst for asymmetric induction

A catalyst for asymmetric induction is provided which comprises an amino acid amide derivative represented by the formula [I]: ##STR1## wherein R.sup.1 represents an isopropyl group, etc., R.sup.2 and R.sup.3 are the same or different and each represents a lower alkyl group, etc., R.sup.4 represents a chlorine atom, etc., R.sup.5, R.sup.6 and R.sup.7 are the same or different and each represents a hydrogen atom, etc., and * denotes an abosolute configuration of S or R, and a titanium (IV) alkoxide. Optically active cyanohydrins are obtained in high yield and at high purity by addition of hydrogen cyanide to aldehyde compounds in the presence of the above mentioned catalyst.

Optically active cyanohydrins are prepared by addition of hydrogen cyanide to aldehydes in the presence of catalysts which comprise the dipeptide derivative represented by the formula ##STR1## wherein R.sup.1 represents an isopropyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a methyl group, a benzyl group or a phenyl group, R.sup.2 represents a benzyl group, an indol-3-ylmethyl group, an isopropyl group, an isobutyl group or a phenyl group, R.sup.3 represents a lower alkoxy group, a hydroxy group or a mono- or di-lower alkylamino group, R.sup.4 represents a hydrogen atom, or R.sup.2 and R.sup.4 are bonded together at their terminals to form a CH.sub.2 CH.sub.2 CH.sub.2 group, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are the same or different, and each represents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group or R.sup.5 and R.sup.6, R.sup.6 and R.sup.7, or R.sup.7 and R.sup.8 are bonded together at their terminals to form CH.dbd.CH--CH.dbd.CH or OCH.sub.2 O, and * denotes an absolute configuration of S or R, and a titanium (IV) alkoxide.

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Tokyo, Japan

Atsunori Mori