<http://webisa.webdatacommons.org/437514260>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.nl> .
<http://webisa.webdatacommons.org/437514260>	<http://www.w3.org/ns/prov#value>	"Preferably, therefore, amine bases such as pyridine, triethylamine, dimethylaminopyridine and 2,6-lutidine, if present at all, are present in the reaction mixture in relatively low concentration." .
<http://webisa.webdatacommons.org/prov/361478194>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/437514260> .
<http://webisa.webdatacommons.org/437514260>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .