Department of Chemistry, University of Alabama. at Birmingham, Birmingham, AL. 35294, U.S.A. The reactions of BCl3 with Cl2AsNMe2 and Me2AsNMe2 have been carried out and followed by temperature-dependent 11B, 13C, and 1H nmr. At —100°, CI2AsNMe2 forms \(Cl_2As\overline{NMe_2.B}Cl_3\). Decomposition of this adduct begins within a short time to yield Me2NBCI2 and AsCI3. At —100°, Me2AsNMe2 gives equimolar amounts of the \(Me_2As\overline{NMe_2.B}Cl_3\) and \(Me_2As\overline{NMe_2.B}Cl_3\)

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... The As — B and N B adducts undergo rearrangement to intermediates that decompose ultimately to a mixture of Me2NBCI2 and Me2AsCI. The reaction of Me2NBCl2 with Me2AsNMe2 at — 90°, gives \(Me_2As\overline{NMe_2.NB}Cl_2\) which subsequently decomposes to (Me2N)2BCI and Me2AsCl. The nmr spectral data for these reactions and the intermediate reaction products are discussed.