TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Base: The base is amine, alkali metal hydroxide or alkaline earth metal hydroxide. The base is added to the reaction liquid in an amount of 1.0-10.0 fold equivalents with respect to the acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Carbonyl compound of formula (1) is reacted with quaternary ammonium compound of formula (3) in acidic solvent containing 0.01 mol/l or more of acid and formaldehyde derivative of formula: HX (2) to obtain a Mannich base of formula (4). The compound (4) in acidic solvent and 1.0-20.0 fold equivalent of base is reacted with diene compound of formula (5) to obtain the compound (I).X=F, Cl, Br, I, CH3COO, CF3COO, CH3SO3, CF3SO3, C6H5SO3, CH3C6H4SO3, HOSO3 or H2PO4;R4=1-20C linear saturated hydrocarbyl, 1-10C saturated hydrocarbyl having hydroxy group, 3-20C branched saturated hydrocarbyl or 3-20C cycloparaffin;or two R4=pyrrolidine ring, piperidine ring, piperazine ring or morpholine ring;X-=F-, Cl-, Br-, I-, CH3COO-, CF3COO-, CH3SO3-, CF3SO3-, C6H5SO3-, CH3C6H4SO3-, HOSO3- or H2PO4-;andR1=H, 1-10C alkyl or F.Preferred Composition: The acidic solvent contains 0.01-2.0 mol/l of acid. The organic solvent is mixed with 5-30C saturated hydrocarbon, and the product obtained is liquid-liquid extracted with 5-30C saturated hydrocarbon. Preferred Process: The heating is performed at 30-180 degrees C. The organic solvent is removed after forming the compound (I), and water is optionally added in order to extract-separate the compound (I). The separated compound (I) is further washed with aqueous alkali solution and aqueous acid solution. EXAMPLE - (In g) 50 %mass dimethylamine aqueous solution (6.83), 35 %mass hydrochloric acid aqueous solution (8.19), paraformaldehyde (2.78) and cyclopentanone (2.59) were reacted. Methyl cellosolve (50 ml), 50 %mass dimethylamine aqueous solution (1.12) and cyclopentanone (7.13) were further added to the reaction mixture and reacted in 120 degrees C oil bath for 90 minutes. n-Heptane (80 ml) was added to the reaction mixture and the organic layer was separate-extracted. The obtained extract was washed with 5 %mass sodium hydroxide aqueous solution, 5 %mass hydrochloric acid aqueous solution and 5% sodium hydrogen carbonate aqueous solution. The washed extract was dried to obtain crude 5-norbornene-2-spiro-2'-cyclopentanone-5'-spiro-2",5"-norbornene (7.4) with yield of 99%. The crude product was subjected to Kugelrohr distillation to obtain 5-norbornene-2-spiro-2'-cyclopentanone-5'-spiro-2",5"-norbornene (4.5) with yield of 61%.