Trivalent phosphorus compounds, such as phosphine oxides (R3P=O), phosphinite (R2P(O)H), or phosphonite (RP(O)(OH)2) derivatives, serve as nucleophiles in these reactions. The lone pair of electrons on phosphorus can attack electrophilic carbon atoms in carbonyl compounds, initiating the cyclization process.
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Benzoic acid, 2,2'-[(phenylphosphinidene)bis(oxy)]bis-, dimethyl ester
2-(trifluoromethyl)-2-oxazoline
