TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A cyclic organic group-containing compound of formula (4) and ester group-containing compounds of formula: R2-C(=O)-O-C(=O)-R2 (5) are reacted in pyridine to obtain merocyanine compound. Preferred Compound: The merocyanine compound is of formula (6).R4,R5=H, hydroxyl, halogen, nitro, cyano, 1-10C alkyl, 6-30C aryl, 7-30C arylakyl or amino;X1=oxygen, sulfur, selenium, -CR6R7-, -NH-, or -NYa-;R6,R7=1-10C alkyl, 6-30C aryl, 7-30C arylalkyl and metal group-containing compound (2), alkyl group-containing compound of formula (7) or cyclic organic group containing compound of formula (8), where R6 and R7 optionally form ring;Ya=H, 1-10C alkyl, 6-30C aryl, 7-30C arylalkyl metal group-containing compound (2) or substituent chosen from -O-, -S-, -CO-, -COO-, -OCO-, -SO2-, -NH-, -CONH-, -N=CH- or -CH=CH- and R1, R3, R4 and R5 are optionally condensed to form ring;L,L',T,T'=double bond, conjugated double bond or triple bond, preferably carbon, oxygen or nitrogen atom;x,y,z=0 or 1;a=0-4;R8=H, 1-4C alkoxy group optionally substituted by alkyl or halogen, halogen atom;R9-R11=1-4C alkyl optionally substituted by hydrogen or halogen, or halogen atom, where R9 and R11 are optionally condensed formed ring;andring=5 or 6 membered ring having hetero atom, naphthalene ring, quinoline ring, isoquinoline ring, anthracene ring or anthraquinone, where ring is optionally substituted by nitro, halogen, cyano, alkyl or alkoxy.Preferred Component: The merocyanine compound is of formula (9).ring B'=benzene ring or naphthalene ring. SPECIFIC COMPOUNDS - 15 Specific merocyanine compounds of formulae is disclosed. E.g. (1Z)-1-(1-benzyl-1,3-dimethyl-1,3-dihydro-2H-benzo(e)indol-2-ylidene)acetone, (1Z)-1-(1,1,3-trimethyl-1,3-dihydro-2H-benzo(e)indol-2-ylidene)acetone, (1Z)-1-(3,3,5-trimethyl-1-propyl-1,3-dihydro-2H-indol-2-ylidene)acetone, (1Z)-1-(1,3,3-trimethyl-5-nitro-1,3-dihydro-2H-indol-2-ylidene)acetone and(1Z)-1-(1-allyl-1,3-dimethyl-1,3-dihydro-2H-benzo(e)indol-2-ylidene)butan-2-one.    EXAMPLE - 2-Naphthyl hydrazine (0.500 mol), (in g) methanol (275), 4-phenyl butane-2-one (0.600 mol), water (1000), toluene (1000), methyliodide (0.200 mol) and methanol (20) were added and reacted under nitrogen atmosphere to obtain a reaction mixture. The obtained reaction mixture was washed, crystallized and dried to obtain quaternary salt. The obtained quaternary salt (0.02 mol), pyridine (0.04 mol), acid anhydride (0.2 mol), water (20) and chloroform (20) were added and reacted to obtain merocyanine compound.