Assertion: boron's compound | /r/HasProperty | elusive
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Source sentences:
text: B−. Nucleophilic anionic boryl compounds have long been elusive but a 2006 study described a boryllithium compound, which reacts as a nucleophile: Organometallic compounds with metal to boron bonds, (i.e., M–BR 2 ), are known as boryl complexes.