| http://www.w3.org/ns/prov#value | - Examples of the Lewis acid include compounds represented by BR3 (R is a phenyl group optionally having a substituent such as fluorine, a methyl group, and a trifluoromethyl group, fluorine or an alkyl group such as methyl group or isobutyl group.) such as trifluoroboron, triphenylboron, tris(4-fluorophenyl)boron, tris(3,5-difluorophenyl)boron, tris(4-fluoromethylphenyl)boron, tris(pentafluoropheny
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