NOVELTY - N-acetoxyphenyl-3-(N,N',N"-tri-t-butoxyformyl-1,4,7,10-tetraazacyclododecane) intermediate (I) is new.    USE - New N-acetoxyphenyl-3-(N,N',N"-tri-t-butoxyformyl-1,4,7,10-tetraazacyclododecane) intermediate is used as molecular probe for chemical sensor, solar battery, and photoelectric device (all claimed).    ADVANTAGE - The new N-acetoxyphenyl-3-(N,N',N"-tri-t-butoxyformyl-1,4,7,10-tetraazacyclododecane) intermediate is colorless and viscous, and has yield of 41.1-42.9%.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of N-acetoxyphenyl-3-(N,N',N"-tri-t-butoxyformyl-1,4,7,10-tetraazacyclododecane) intermediate. N,N-bis(2-aminoethyl)amine reacts with tosyl chloride in presence of base to obtain 4-methyl-N-(2-(N-(2-((4-methylbenzene)sulfonamido)ethyl)(4-methylbenzene)sulfonamido)ethyl)benzene-1-sulfonamide. 2-(2-Hydroxy-ethylamino)-ethanol reacts with tosyl chloride in presence of base to obtain 2-(N-(2-(((4-methylbenzene)sulfonyl)oxy)ethyl)(4-methylbenzene)sulfonamido)ethyl 4-methylbenzene-1-sulfonate. 4-Methyl-N-(2-(N-(2-((4-methylbenzene)sulfonamido)ethyl)(4-methylbenzene)sulfonamido)ethyl)benzene-1-sulfonamide reacts with 2-(N-(2-(((4-methylbenzene)sulfonyl)oxy)ethyl)(4-methylbenzene)sulfonamido)ethyl 4-methylbenzene-1-sulfonate to obtain 1,4,7-trimethyl-10-((4-methylbenzene)sulfonyl)-1,4,7,10-tetraazacyclododecane. The obtained compound reacts with hydrochloric acid, sulfuric acid and sodium hydroxide to obtain 1,4,7,10-tetraazacyclododecane. The obtained compound reacts with di-tert-butyl pyrocarbonate, trimethylamine and dimethylene dichloride to obtain 1,4,7-tri-tert-butyl 1,4,7,10-tetraazacyclododecane-1,4,7-tricarboxylate. The resultant compound is refluxed in presence of chloroacetonitrile, potassium carbonate, potassium iodide and cyanomethane for 24 hours to obtain 1,7-di-tert-butyl 4-(cyanomethyl)-1,4,7,10-tetraazacyclododecane-1,7-dicarboxylate. The obtained compound is reduced in presence of Raney nickel/hydrogen, and refluxed in presence of ethanol and ammonia to obtain 1,7-di-tert-butyl 4-(2-aminoethyl)-1,4,7,10-tetraazacyclododecane-1,7-dicarboxylate. The obtained compound reacts with bromine-containing compound of formula: Br-CH2-C(=O)-O-Bn in presence of potassium carbonate and methylene cyanide, and refluxed at 12 hours to obtain N-acetoxyphenyl-3-(N,N',N"-tri-t-butoxyformyl-1,4,7,10-tetraazacyclododecane) intermediate.