Qualitatively, 1-Al and 1-Ga appeared to be more active catalysts than 1-B. The scope of hydrodefluorination was investigated. A series of electron-deficient aromatics including nitro, nitrile, ester, and acid functional groups underwent hydrodefluorination with more forcing conditions and higher loadings required for less electron-deficient substrates (5b-5n). Fluorinated alkenes such as perfluorocyclopentene and hexafluoropropene were also reactive and could be transformed into hydrodefluorination products 5o:5o' and 5p:5p' respectively in reasonable yields (Figure ).