TRIAZOLOPYRIDINE COMPOUNDS.

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The invention is concerned with triazolopyridine compounds of formula (I), wherein R1, R2 , R3 and R4 are as defined in the description and in the claims, as well as physiologically acceptable salts thereof. These compounds inhibit PDEIOA and can be used as medicaments. The invention is concerned with triazolopyridine compounds of formula (I), wherein R1, R2 , R3 and R4 are as defined in the description and in the claims, as well as physiologically acceptable salts thereof. These compounds inhibit PDEIOA and can be used as medicaments. Disclosed is a neodymium based homogeneous phase rare earth catalyst and the neodymium based homogeneous phase rare earth catalyst is prepared by a process comprising the steps of : 1）in an inert solvent, preparing a mixture solution containing a neodymium carboxylate compound component a, a halogen-containing compound component c and a conjugated diene component d; 2）adding an organo-aluminium compound component b to the mixture solution obtained from step 1） to obtain said neodymium based homogeneous phase rare earth catalyst; wherein the organo-aluminium compound is selected from an alkylaluminium of a general formula AlR3 and an alkylaluminium hydride of a general formula AlHR2, in which R is a C1-C6 linear or branched alkane; the molar ratio of each component in the catalyst is 1 : 5-30 : 2-10 : 35-65 of a : b : c : d. Disclosed also is another neodymium based homogeneous phase rare earth catalyst prepared by a process comprising the steps of : 1）in an inert solvent, preparing a mixture solution containing a neodymium carboxylate compound component a, a halogen-containing compound component c, a carboxylic acid component e and a conjugated diene component d; 2）adding an organo-aluminium compound component b to the mixture solution obtained from step 1） so as to obtain the neodymium based homogeneous phase rare earth catalyst; wherein the organo-aluminium compound is selected from an alkylaluminium of a general formula AlR3 and an alkyl aluminium hydride of a general formula AlHR2, in which R is a C1-C6 linear or branched alkane; the molar ratio of each component in the catalyst is 1 : 10-30 : 2-5 : 25-100 : 0.2-4 of a : b : c : d : e. Disclosed also is a process for preparing a conjugated diene polymer, in which a polymer solution is obtained by the solution polymerization of the conjugated diene monomer in a solvent under the action of the abovementioned catalyst, wherein the process comprises a procedure for lowering the viscosity of the polymer solution using an ionic surfactant, especially an anionic surfactant, and using a premix system comprising a circular tube mixer and an axial flow pump, or a premix system comprising a premix kettle.