Functionalized Pentafluoroethylphosphanes

Abstract

Bis(diethylamino)pentafluoroethylphosphane represents a versatile starting material for the synthesis of functionalized pentafluoroethylphosphanes. Perfluoroalkyl substituted aminophosphanes themselves already exhibit interesting coordination properties and were treated with the catalytically relevant salts PtCl2 and PdCl2 affording trans-[Cl2M{P(C2F5)(NEt2)2}2]. The hitherto unknown (C2F5)PBr2, accessible in good yields by treatment of C2F5P(NEt2)2 with HBr, was smoothly transformed into the corresponding phosphane, C2F5PH2, or fluoro derivative, C2F5PF2. Acidic hydrolysis of C2F5 P(NEt2)2 yielded the phosphinic acid C2F5P(O)(OH)H, the anion of which was structurally characterized. The phosphinic acid smoothly adds to the carbonyl group of acetone under P-C bond formation. An analogous reaction with aldehydes, for example, salicyl aldehyde, offers the possibility to generate stereocenters.

Synthesis and Reactivity of New Functionalized Perfluoroalkylfluorophosphates

“…All chemicals were obtained from commercial sources and used without further purification. (C 2 F 5 )PF 2 , [23] (C 2 F 5 ) 2 PF, [24] P(C 2 F 5 ) 3 [25] and Me 2 NCH 2 F [14] were synthesized according to literature methods. Standard high vacuum techniques were employed throughout all preparative procedures.…”