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Synthesis of 1,1-dibromoalkenes

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Activation of the C-Br bond of CBrX3 (X = Cl, Br) using 9-mesityl-10-methylacridinium perchlorate as a visible-light photocatalyst enables the synthesis of gem-dihaloenones from terminal alkynes via a SET mechanism.
T. K. Dinda, P. Mal, J. Org. Chem., 2023, 88, 573-584.


A base-promoted dibromination of enamides using CBr4 as a bromine source provides β,β-dibrominated secondary enamides. These novel products can be readily transformed to 5-Br oxazoles via Cu(I) catalyzed intramolecular cyclization in good yields.
J. Ma, Q. Zou, C. Wang, G. Yin, F. Li, J. Org. Chem., 2022, 87, 15670-15678.