TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): The olefin-containing compound of formula (1 or 2) is irradiated with electromagnetic waves to obtain olefin-containing compound of formula (2 or 1), respectively. Preferred Definitions:R3,R4=arylamine group of formula (3), preferably of formula (4).    Ar1,Ar2=6-40C aryl, 2-40C heteroaryl having aryl group optionally substituted by R5 groups;    R5,R5a,R5b=H, fluoro, chloro, bromo, iodo, CN, NO2, OH, Si(R6)3, N(R6)2, B(R6)2, optionally branched or cyclic alkyl, alkoxy or thio alkoxy group having non-adjacent carbon atoms optionally substituted by -CR6=CR6-, -CC-, NR6-, -O-, -S-, -CO-O- or -O-CO-O-, and hydrogen optionally substituted by fluoro, or 6-40C aryl, 2-40C heteroaryl, 6-40C aryloxy, or heteroaryl oxy (all optionally substituted by fluoro, chloro, bromo, iodo, CN, NO2, OH, Si(R6)3, N(R6)2, B(R6)2, optionally branched cyclic alkyl, alkoxy or 40C or less thio alkoxy having non-adjacent carbon atoms optionally substituted by -CR6=CR6-, -CC-, NR6-, -O-, -S-, -CO-O- or -O-CO-O-, and having H atoms substituted by fluoro);    R6=H or 1-20C aliphatic or aromatic hydrocarbyl;and    x,y=0-4.    Two or more R5 groups may mutually form aliphatic or aromatic, monocyclic or polycyclic ring system.    SPECIFIC COMPOUNDS - The olefin-containing compound (1) is 2,3-bis(N,N-bis(p-anisyl)4-aminophenyl ethynyl)dimethyl fumarate of formula (5) and the compound (2) is 2,3-bis(N,N-bis(p-anisyl)4-aminophenyl ethynyl)dimethyl maleate of formula (6) (both claimed).    EXAMPLE - 2,3-Dibromo-dimethyl fumarate (in mg) (400), copper iodide (27), bis(triphenylphosphine)palladium (II) dichloride (100), N,N-bis(p-anisyl)-4-ethynyl benzene-amine (940) and spin dried triethylamine (40 ml) were heat-stirred at 100 degrees C for 2 hours. The mixture was cooled and dichloromethane was added. The solvent was distilled off and 2,3-bis(N,N-bis(p-anisyl)4-aminophenyl ethynyl)dimethyl fumarate (770) was obtained as dark red solid. The obtained compound (200) was dissolved in toluene (120 ml) and irradiated with high pressure mercury vapor lamp for 24 hours. Toluene was distilled off and 2,3-bis(N,N-bis(p-anisyl)4-aminophenyl ethynyl)dimethyl maleate (185) was obtained with yield of 92%.