Methods to activate the carboxylic acid include reacting said acid with {HEAD ~ one or more molar equivalents} of oxalyl chloride or {TAIL ~ thionyl chloride} to afford the carboxylic acid chloride in a suitable solvent such as dichloromethane, chloroform or diethyl ether 
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Methods to activate the carboxylic acid include reacting said acid with { HEAD ~ one or more molar equivalents } of oxalyl chloride or { TAIL ~ thionyl chloride } to afford the carboxylic acid chloride in a suitable solvent such as dichloromethane , chloroform or diethyl ether
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH