Dimethylaminoborane

Product Name:Dimethylaminoborane
CAS No.:74-94-2
Synonyms:View MoreDIMETHYLAMINE BORANE; borane*Me2NH; Dimethylaminoboran; DMAB; BORANE-DIMETHYLAMINE; Dimethyl-amineaqueous; BORON HYDRIDE DIMETHYLAMINE;
Formula:C2H9BN
Exact Mass:58.08280
Molecular Weight:57.91060
PSA:23.85000
LogP:-0.68970
Safety Statements:S15-S16-S33-S36-S45
HS Code:29420000
Packing Group:II
WGK Germany:2
RIDADR:UN 2926
Risk Statements:R11;R20;R24/25;R36/37/38
Hazard Codes:F:Flammable


The reaction of cyclodiborazane [Me(2)N-BH(2)](2) with the chloro(dihydrogen) ruthenium complex RuHCl(η(2)-H(2))(P(i)Pr(3))(2) (1) led to the formation of the unsymmetricaly coordinated dimethylaminoborane complex RuHCl(H(2)BNMe(2))(P(i)Pr(3))(2) (2). The dimethylaminoborane coordination (H(2)BNMe(2)) to the ruthenium center in 2 was carefully studied by combining X-ray, multinuclear NMR, and density functional theory (DFT) techniques, and compared with the recently reported osmium analogue which was originally formulated as a σ-B-H borinium complex [OsH(2)Cl(HBNMe(2))(P(i)Pr(3))(2)] (4). All our data are in favor of a bis(σ-B-H) coordination mode at a very activated stage in the case of the ruthenium complex 2, whereas in the osmium complex 4, full oxidative addition is favored leading to a complex better formulated as an osmium(IV) boryl species with an α-agostic B-H interaction. The synthesis and characterization of the symmetrical dihydride complex RuH(2)(H(2)BNMe(2))(P(i)Pr(3))(2) (3) from addition of the lithium dimethylaminoborohydride to 1 is reported for comparison.

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