When urea derivatives (N-aryl-N’,N’-dialkyl urea) or (N-aryl-N’-alkyl/aryl urea) 1a-1u react with diethylcarbamyl chloride at 50-60 ºC symmetrical 1,3-disubstituted ureas 2a-2f were formed as major products instead of forming ployureas.
SHAHNAZ PARVEEN ,KHALID MOHAMMED KHAN ,SANA MUSTAFA ,
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