About: http://webisa.webdatacommons.org/121261018

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	y condensation with a phosphonium halide ##STR8## in which R1, R2 and alk are as defined above and Hal is a halogen atom, preferably bromine, and with a base, for example sodium amide, in tetrahydrofuran.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com