Silicon-mediated direct conversion of acyl chlorides to carbamoyl azides or/and tetrazolinones under mild conditions
A simple and mild one-pot procedure for the synthesis of carbamoyl azides from acyl chlorides utilizing a combination of tetrachlorosilane and sodium azide in acetonitrile at ambient temperature is reported. Under gentle heating 1-aryltetrazolin-5- ones were also obtained in one-pot process presumably via a [3 + 2] cycloaddition step.
Salama, Tarek A.,Elmorsy, Saad S.,Khalil, Abdel-Galil M.,Ismail, Mohamed A.
experimental part
p. 1149 - 1151
(2012/08/07)
An unplanned synthesis of symmetrical 1,3-disubstituted ureas
When urea derivatives (N-aryl-N′, N'-dialkyl urea) or (N-aryl-N'-alkyl/arvl urea) la-lu react with diethylcarbamyl chloride at 50-60°C symmetrical 1,3-disubstituted ureas 2a-2f were furmed as major products instead of forming ployureas.
Perveen, Shahnaz,Mustafa, Sana,Khan, Khalid Mohammed
experimental part
p. 229 - 234
(2011/10/05)
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