Syntheses and Solid-State Structure Analyses of Pentafluoroethylated Arsanes

Area of Science:

• Organometallic Chemistry
• Fluorine Chemistry
• Arsenic Chemistry

Background:

• Pentafluoroethylated arsanes are valuable compounds with diverse applications.
• Existing synthesis methods may have limitations in yield or control.

Purpose of the Study:

• To develop an improved and controlled synthesis of pentafluoroethylated arsanes.
• To characterize the synthesized compounds using advanced analytical techniques.

Main Methods:

• Deprotonation of pentafluoroethane using n-butyllithium to form pentafluoroethyllithium.
• Reaction of pentafluoroethyllithium with arsenic trichloride and subsequent functionalization using diethylamino protecting groups.
• Characterization of products via multinuclear NMR spectroscopy and X-ray diffraction analysis.

Main Results:

• Successful synthesis of tris(pentafluoroethyl)arsane in good yields.
• Controlled synthesis of partially substituted arsanes, As(C2F5)2(NEt2) and As(C2F5)(NEt2)2, using protecting groups.
• Isolation and characterization of novel halogenoarsanes, As(C2F5)nCl3-n and As(C2F5)nBr3-n (n=1,2).

Conclusions:

• The developed method provides an efficient route to various pentafluoroethylated arsanes.
• The use of protecting groups allows for precise control over the degree of substitution at the arsenic center.
• The synthesized compounds are characterized as colorless, volatile liquids with determined solid-state structures.