摘要:
A process for producing an optically active alcohol represented by formula (I): ##STR1## wherein R.sub.1 is an alkyl group having from 2 to 11 carbon atoms, an alkenyl group having from 3 to 11 carbon atoms, an alkadienyl group having from 6 to 11 carbon atoms, a cyclohexyl group, an cyclohexylmethyl group, or a cyclohexylethyl group, provided that the olefin in the alkenyl group or alkadienyl group is not conjugated to the olefin at the 2-position thereof; and * means an asymmetric carbon atom,is disclosed, comprising subjecting an olefinic alcohol represented by formula (II): ##STR2## wherein R.sub.1 is the same as defined above to asymmetric hydrogenation in the presence of, as a catalyst, a ruthenium-optically active phosphine complex.According to the process of the invention, the desired optically active alcohols which are useful not only as intermediates for the manufacture of perfumes and vitamin E but also as liquid crystal materials can be produced with high optical purities.
摘要:
A ruthenium-phosphine complex having a 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl or its derivative as a ligand and carboxyl groups bonded to the ruthenium atom thereof is disclosed. The complex is inexpensive and exhibits excellent performances as a catalyst for various organic syntheses, and particularly for asymmetric hydrogenation.
摘要:
Disclosed is a metallic cylindrical member and a metallic bracket that can prevent a change in inside diameter of the metallic cylindrical member which is induced with an external force applied on cooling of the welded portion. When forming the bracket by engaging projections and recesses with each other, which projections and recesses are formed at left and right sides A, B of a metallic plate, portions P through S which span adjacent projections are crushed stripewise in the wall thickness direction to form indentations, thereby supplying metal which is forced out of the indentations P through S to around each of the projections to enhance the adhesion between adjacent projections and realize a strong joining of both left and right sides of the metallic plate.
摘要:
A mechanism of reclining a vehicular seat having a gear plate having an internal gear provided at a casing on one side having a hole, a side wall and a recess portion, a cam having a lock face and an unlock face, a lock gear plate arranged movably at the recess portion and having a locking portion and a lock face and a casing on other side provided to be opposed to the casing on the one side and is a mechanism of reclining a vehicular seat in which by moving the cam, an operating member is operated to bend, the lock gear plate is moved, by moving the lock gear plate, mesh between the gear and the internal gear is released, by moving the cam to an original state, the lock gear plate is recovered by operating the operating member to recover to an original state to thereby achieve mesh between the gear of the lock gear plate and the internal gear.
摘要:
A card processing method of recording information or displaying, rewriting or erasing recorded information in a card having a magnetic recording portion, and a rewritable display portion which employs a reversible thermosensitive recording material, in which the step (a) of reading recorded information in the magnetic recording portion and the step (b) of rewriting the recorded information in the magnetic recording portion are carried out prior to the step (c) of erasing recorded information from the rewritable display portion and the step (d) of writing information in the rewritable display portion.
摘要:
There is provided a headrest support structure for attaching a headrest to a car seat. It comprises a headrest 20; a headrest stay 21; a height regulating engagement portion 21b; a first slip-off preventing engagement portion 21c; a tubular member 12 for engaging the headrest stay. The tubular member is vertically provided in the car seat. The headrest support structure also has a first locking member operating unit 32 provided on the upper end of the tubular member; and a first elastic member 32c for forcing the first locking member toward the headrest stay, for engaging the height regulating engagement portion or the first slip-off preventing engagement portion. By an pushing operation from the outside, the first locking member is moved back to release the height regulating engagement portion or the first slip-off preventing engagement portion. The headrest support structure also has a second locking member operating unit, comprising a second slip-off preventing engagement portion 21c, a second locking member32d, 320d, 322d 322d-1; a second elastic member 322f, 332f, 32f. The second locking member operating unit also comprises an engagement releasing mechanism for releasing the second locking member from the second slip-off preventing engagement portion.
摘要:
The perfume composition containing 4- (or 5-)-acyl-1,1- (or 3,3-)-[a] compound, which is a novel compound expressed by the formula I, has noble musk fragrance. In addition, this perfume composition has characteristics that it is excellent in both quality and strength of the fragrance, of high safety and capable of being manufactured with low costs.
摘要:
A cured or uncured composition of a homopolymer or copolymer of an epihalohydrin comprising a homopolymer or copolymer of an epihalohydrin, a curing amount of a curing agent therefor and an acid acceptor, characterized in that the curing agent and acid acceptor are free from a cyclic carboxylic acid anhydride and consist, based on 100 parts by weight of the epihalohydrin homopolymer or copolymer, of(a) a component selected from the group consisting of 1 to 200 parts by weight of an acid salt of 1 mole of a polybasic carboxylic acid with 1 mole of 1,8-diazabicyclo(5,4,0)undecene-7 and a mixture of 1 to 200 parts by weight of a polybasic carboxylic acid and 1 to 10 parts by weight of a neutral salt of 1,8-diazabicyclo(5,4,0)undecene-7, and(b) 1 to 20 parts by weight of a specific metal compound of Group II and Group IVa of the periodic table of elements.
摘要:
A cured or uncured composition of homo- or copolymer of epihalohydrins comprising a homo- or copolymer of an epihalohydrin, curable amounts of a curing agent therefor and an acid acceptor, characterized in that said curing agent and acid acceptor consist, on the basis of 100 parts by weight of said homo- or copolymer of epihalohydrin, of (a) 0.1 - 10 parts by weight of a cyclic carboxylic acid anhydride, (b) 0.1 - 10 parts by weight of a compound selected from the group consisting of 1,8-diazabicyclo(5,4,0)undecene-7 and salts thereof, and (c) 0.5 - 20 parts by weight of a metal compound selected from the group consisting of the oxides of the metals of group II of the periodic table of elements, hydroxides of said group II metals, carbonates of said group II metals, carboxylic acid salts of said group II metals, oxides of the metals of group IVa of the periodic table of elements, basic carbonates of said group IVa metals, basic carboxylic acid salts of said group IVa metals and basic phosphites of said group IVa metals.
摘要:
Improved process for preparing a cross-linked epichlorohydrin elastomer composition by heating an epichlorohydrin elastomer in the presence of a compound selected from the group consisting of the quinones and derivatives thereof of the following formula ##SPC1##Wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, are each a member selected from the class consisting of hydrogen and the hydrocarbon groups, and R.sub.1 and R.sub.2 taken together, may form a benzene ring.