About: http://webisa.webdatacommons.org/8860784

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	Preferred phosphonium halides are those conforming to the formula ##STR1## wherein X is a halogen atom, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and represent
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com