Fluorinated Alkynylphosphonates in C,C‐Cyclizations: Regioselective Formation of Polysubstituted Fluorinated Arylphosphonates.

1,4-Bipolar substrates of type (I) and (IV) having an acidic CH2-group react with internal alkynes (II) to produce naphthalenes or polyfunctionalized benzenes, resp., containing a -CF2-X group.