Visible‐Light‐Promoted Formation of C—C and C—P Bonds Derived from Evolution of Bromoalkynes under Additive‐Free Conditions: Synthesis of 1,1‐Dibromo‐1‐en‐3‐ynes and Alkynylphosphine Oxides

Main observation and conclusion The controllable achievement of C—C and C—P bond formations is developed via visible‐light‐promoted bromoalkyne dimerization or its further transformation with secondary phosphine oxides. The 1,1‐dibromo‐1‐en‐3‐ynes are formed when bromoalkyne is exposed to visible‐light. While alkynylphosphine oxides are generated when bromoalkynes are mixed with secondary phosphine oxides.