<http://webisa.webdatacommons.org/175563021>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .
<http://webisa.webdatacommons.org/prov/49424464>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/175563021> .
<http://webisa.webdatacommons.org/175563021>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/175563021>	<http://www.w3.org/ns/prov#value>	"presence of a base, for example sodium hydride, in the presence of an inert organic liquid which is preferably a solvent for the reactants, for example N,N-dimethyl-formamide, and then reacting at a temperature in the range 0-250.degree." .