| http://www.w3.org/ns/prov#value | - Other acids such as sulfuric acid, hydrofluoric acid, hydrochloric acid, and acetic acid optionally in conjunction with boron trifluoride, can be used, or electrophiles other than H+, such as halogens (chlorine Cl2, bromine Br2, iodinemonochloride ICl), or acid chlorides such as acetylchloride, or electrophiles such as mercuric chloride, can also be used.
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