TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): 5-Norbornene-2-spiro-( alpha )-cycloalkanone-( alpha ')-spiro-2",5"-norbornene of formula (III) is reacted with alcohol in the presence of carbon monoxide to obtain the compound (II) and its ester. The compound (II) is reacted with formic acid, acidic catalyst (a palladium compound), an oxidising agent, acetic anhydride, to obtain the compound (I).    TECHNOLOGY FOCUS - POLYMERS - Preferred Property: The solution containing 0.5 g/dl of polyamic acid dissolved in N,N-dimethylacetamide has intrinsic viscosity of 0.05-3.0 dl/g measured at 30 degrees C using dynamic viscosity meter. Preferred Definitions:    R10=phenylene, naphthylene or biphenylene group of formula (a) or (b);    R11=H, F, methyl, ethyl or trifluoromethyl;and    Q=-O-, -S-, -CO-, -CONH-, -SO2-, -C(CF3)2-, -C(CH3)2-, -CH2-, -OC6H4-C(CH3)2-C6H4O-, -OC6H4-SO2-C6H4-O-, -C(CH3)2-C6H4-C(CH3)2-, -OC6H4-C6H4O- or -OC6H4O-.    EXAMPLE - (In g) dimethylamine (6.83) added as 50 % mass aqueous solution, 35 % mass hydrochloric acid aqueous solution (8.19), paraformaldehyde (2.78), cyclopentanone (2.59), Mannich base, methyl cellosolve (50 ml), 50 % mass dimethylamine aqueous solution (1.12) and cyclopentadiene (7.13) were reacted. The liquid mixture was heated to 120 degrees C for 90 minutes, cooled to room temperature, added to n-heptane (40 ml) and extracted. The organic layer was washed with 5 % mass sodium hydroxide aqueous solution and 5 % mass hydrochloric acid aqueous solution to obtain 5-norbornene-2-spiro-( alpha )-cyclopentanone-( alpha ')-spiro-2",5"-norbornene (7.4). The obtained compound (2), methanol (800 ml), sodium acetate (7.52), cupric chloride (8.59) and palladium chloride were reacted to obtain norbornane-2-spiro-( alpha )-cyclopentanone-( alpha )'-spiro-2"-norbornane-5,5",6,6"-tetracarboxylic tetramethyl ester (3.93) with yield of 99.1%. The obtained ester was reacted with formic acid (17 ml) and acetic anhydride (18 ml), and heat-refluxed at 120 degrees C for 3 hours. The reaction liquid was concentrated and the residue was mixed with diethyl ether to obtain grey crude product. The crude product was sublimed to obtain norbornane-2-spiro-( alpha )-cyclopentanone-( alpha )'-spiro-2"-norbornane-5,5",6,6"-tetracarboxylic dianhydride (0.89) with yield of 89.1%.