Abstract: A low decarburization high toughness spring steel for an automobile suspending spring, and a manufacturing process therefor, are disclosed. In this steel, the effect of the sag resistance promoting element (Si) is maximized without reducing the carbon content, so that the problems of the decarburization and the lowering of the toughness (caused by the addition of silicon) should be solved during the manufacturing of the spring steel. The spring steel of the present invention is composed of in weight %: 0.5-0.7% of C, 1.0-3.5% of Si, 0.3-1.5% of Mn, 0.3-1.0% of Cr, 0.05-0.5% of V and/or Nb, less than 0.02% of P, less than 0.02% of S, 0.5-5.0% of Ni, and other indispensable impurities, the balance being Fe.

Abstract: The present invention relates to a novel process for preparing sulfonylurea derivatives of formula (I) in a high purity and a high yield characterized in that a sulfonylchloride of formula (V) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII) in the presence of a metal cyanate and an organic base catalyst or a compound of formula (VIII) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII): ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl and R.sup.3 represents hydrogen, methyl, ethyl or phenyl, and to a process for preparing the sulfonylchloride compound of formula (V) above and the compound of formula (VIII) above, both of which are useful as an intermediate compound for preparing the sulfonylurea derivative of formula (I) and to a novel intermediate compound of formula (VIII) as defined above.

Abstract: The present invention relates to a novel process for preparing sulfonylurea derivatives of formula (I) in a high purity and a high yield characterized in that a sulfonylchloride of formula (V) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII) in the presence of a metal cyanate and an organic base catalyst or a compound of formula (VIII) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII): ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl and R.sup.3 represents hydrogen, methyl, ethyl or phenyl, and to a process for preparing the sulfonylchloride compound of formula (V) above and the compound of formula (VIII) above, both of which are useful as an intermediate compound for preparing the sulfonylurea derivative of formula (I) and to a novel intermediate compound of formula (VIII) as defined above.

Abstract: The present invention relates to a novel process for preparing sulfonylurea derivatives of formula (I) in a high purity and a high yield characterized in that a sulfonylchloride of formula (V) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII) in the presence of a metal cyanate and an organic base catalyst or a compound of formula (VIII) is reacted with 2-amino-4,6-dimethoxypyrimidine of formula (VII): ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl and R.sup.3 represents hydrogen, methyl, ethyl or phenyl, and to a process for preparing the sulfonylchloride compound of formula (V) above and the compound of formula (VIII) above, both of which are useful as an intermediate compound for preparing the sulfonylurea derivative of formula (I) and to a novel intermediate compound of formula (VIII) as defined above.

Abstract: The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonylurea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl,R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, andR.sup.3 represents hydrogen, methyl, ethyl or phenyl.

Abstract: The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonylurea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl,R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, andR.sup.3 represents hydrogen, methyl, ethyl or phenyl.

Abstract: A surface mount semiconductor package having a novel lead configuration which facilitates a higher packing density than presently available semiconductor packages. More particularly, the package includes a plurality of electrical leads each having a laterally outwardly extending portion, a downwardly extending portion depending from an inner distal end of the laterally extending portion, and a foot portion extending laterally inwardly from a lower distal end of the downwardly extending portion. A semiconductor chip is mounted, preferably by adhesive means such as insulating tape, to the foot portion of the leads. A plurality of electrical wires are connected between an upper surface of the chip and the laterally outwardly extending portion of respective ones of the leads. A protective body, such as a molded resin body, encapsulates the chip, the wires, the laterally outwardly and downwardly extending portions of the leads.

Abstract: The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonylurea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl,R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, andR.sup.3 represents hydrogen, methyl, ethyl or phenyl.

Abstract: The present invention relates to a process for preparation of 5-pyrazolemercaptan derivatives represented by the following general formula (I), which is useful for synthesis of sulfonyl-urea-based herbicides, and an intermediate thereof, ##STR1## wherein R.sup.1 represents hydrogen, C.sub.1 -C.sub.4 alkyl, allyl or propargyl,R.sup.2 represents hydrogen, C.sub.1 -C.sub.4 alkyl, or a phenyl group which can contain one or more substituent selected from the group consisting of halogen, nitro and methyl at an optional position, andR.sup.3 represents hydrogen, methyl, ethyl or phenyl.