Abstract: A method of purifying dimethyl sulfoxide includes distilling a dimethyl sulfoxide-containing liquid in the presence of sodium carbonate under a reduced pressure in an inert gas atmosphere to distill out dimethyl sulfoxide, an amount of the sodium carbonate with respect to 100 g of pure dimethyl sulfoxide in a residual liquid after the distillation being 6 times or more the amount of the sodium carbonate with respect to 100 g of the pure dimethyl sulfoxide in the dimethyl sulfoxide-containing liquid before the distillation.

Abstract: A method of purifying dimethyl sulfoxide includes distilling a dimethyl sulfoxide-containing liquid in the presence of sodium carbonate in an inert gas atmosphere to distill out dimethyl sulfoxide, an amount of the sodium carbonate with respect to 100 g of pure dimethyl sulfoxide in a residual liquid after the distillation being 6 times or more the amount of the sodium carbonate with respect to 100 g of the pure dimethyl sulfoxide in the dimethyl sulfoxide-containing liquid before the distillation.

Abstract: A method of purifying dimethyl sulfoxide includes distilling a dimethyl sulfoxide-containing liquid in the presence of sodium carbonate in an inert gas atmosphere to distill out dimethyl sulfoxide, an amount of the sodium carbonate with respect to 100 g of pure dimethyl sulfoxide in a residual liquid after the distillation being 6 times or more the amount of the sodium carbonate with respect to 100 g of the pure dimethyl sulfoxide in the dimethyl sulfoxide-containing liquid before the distillation.

Abstract: A method for efficiently resolving optical isomers, in which a discriminating liquid consisting of a discriminating agent capable of discriminating optical isomers and a diluent are brought into contact with a mixture containing said optical isomers in countercurrent flow, to resolve the optical isomers by adsorption separation, distillation separation, absorption separation or membrane separation, and recovered at an optical isomer content of 5 wt % or less for recycled use, under one or more of the following conditions: (a) the dielectric constant of the diluent is 30 or less and the viscosity of the discriminating liquid is 0.

Abstract: Novel tricyclic triazolo derivatives and pharmaceutically acceptable salts thereof, which are useful as anti-inflammation agents, anti-allergy agents or anti-PAF agents as well as processes for producing the same are disclosed. The triazolo derivatives of the present invention are represented by the formula (I): ##STR1## ?wherein R.sup.1 represents hydrogen, lower alkyl or C.sub.3 -C.sub.5 cycloalkyl; R.sup.2 and R.sup.3 respectively represent hydrogen, lower alkyl, lower alkoxy or halogen; W represents C.dbd.O or CR.sup.4 R.sup.5 (wherein R.sup.4 and R.sup.5 respectively represents hydrogen or lower alkyl); A represents C.sub.1 -C.sub.5 straight or branched saturated or unsaturated alkylene which may contain one or more hetero atoms; l represents 0 to 2, n represents 1 to 3, . . . represents single bond or double bond; Y represents N or C; Z represents C(B)Ar.sup.1 Ar.sup.2 (wherein B represents hydrogen, hydroxy or methoxy, Ar.sup.1 and Ar.sup.

Abstract: An agent for suppressing infiltration of eosinophils comprising as an effective ingredient a tricyclic triazolo derivative, which strongly suppresses infiltration of eosinophils into inflammatory regions, of the formula (I): ##STR1## wherein R.sup.1 represents hydrogen, lower alkyl, C.sub.3 -C.sub.5 cycloalkyl or substituted or non-substituted aryl; R.sup.2 and R.sup.3 independently represent hydrogen, lower alkyl, lower alkoxy or halogen; W represents C.dbd.O or CR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 independently represent hydrogen or lower alkyl; A represents C.sub.1 -C.sub.5 straight or branched saturated or unsaturated alkylene with the proviso that it may contain one or more hetero atoms; 1 represents 0 to 2, n represents 1 to 3, -- represents single bond or double bond; Y represents N or C; Z represents C(B)Ar.sup.1 Ar.sup.2 wherein B represents hydrogen, hydroxy or methoxy, Ar.sup.1 and Ar.sup.2 independently represent hydrogen or substituted or non-substituted aryl, CAr.sup.1 Ar.sup.