Phenyl 4,5-Dichloro-6-Oxopyridazine-1(6H)-Carboxylate as Carbonyl Source: Facile and Selective Synthesis of Carbamates and Ureas under Mild Conditions - Lee, Hyung-Geun; Kim, Min-Jung; Park, Song-Eun; Kim, Jeum-Jong; Kim, Bo Ram; Lee, Sang-Gyeong; Yoon, Yong-Jin (Synlett, 2009)