Abstract: A polymer electrolyte composition comprising a component (A) and a component (B) described below, wherein if the equivalent weight of cation exchange groups in the component (A) is termed Ic, and the equivalent number of anion exchange groups in the component (B) is termed Ia, then the equivalent weight ratio represented by Ic/Ia is from 1 to 10,000.

Abstract: The present invention provides a catalyst comprising (A) a tantalum compound, and (B) an organic metal compound, wherein the organic metal compound (B) comprises at least one group selected from the group consisting of the following (1) to (5): (1) a branched or cycloalkyl-substituted primary alkyl group having 4 to 15 carbon atoms, (2) an aryl-substituted primary alkyl group having 7 to 15 carbon atoms, (3) a 3-alkenyl group having 4 to 15 carbon atoms, (4) a secondary alkyl group having 3 to 15 carbon atoms which may be substituted with an aryl group or a cyclic alkyl group having 3 to 15 carbon atoms, and (5) a secondary alkenyl group having 4 to 15 carbon atoms, the catalyst showing good olefin trimerizing activity.

Abstract: There is disclosed a process for producing 1-hexene, which comprises trimerizing ethylene in the presence of a catalyst comprising a tantalum compound and an alkylating agent containing a metal under a condition wherein the water content in the reaction system is 4 moles or less per mole of the tantalum atom, and/or under a condition wherein the amount of molecular oxygen in the reaction system is 2 moles or less per mole of the tantalum atom.

Abstract: A pyridazin-3-on derivative of the formula (1): in which R2 is a hydrogen atom or a C1-C3 alkyl group, R3 is a hydrogen atom or a C1-C3 alkyl group, and Q is an optionally substituted phenyl group can be prepared at a high yield and high purity by ring closing a carboxylic acid derivative of the formula (2): in which R2, R3 and Q are the same as defined above, or its salt in the presence of a nitrogen-containing aromatic compound and a boron compound.