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<http://webisa.webdatacommons.org/16623672>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .
<http://webisa.webdatacommons.org/prov/262361843>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/16623672> .
<http://webisa.webdatacommons.org/prov/412787599>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/16623672> .
<http://webisa.webdatacommons.org/prov/352787309>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/16623672> .
<http://webisa.webdatacommons.org/16623672>	<http://www.w3.org/ns/prov#value>	"Pyridine or an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide, etc., is used as the catalyst, and methylene chloride, chloroform," .