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Reference.org
Wittig reagents
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, Wittig reagents are <a href="/facts/Organophosphorus_compound/kNgIF93U">organophosphorus compounds</a> of the formula R3P=CHR', where R is usually <a href="/facts/Phenyl/Ql9Yx5uu">phenyl</a>. They are used to convert ketones and aldehydes to alkenes: </p>