Tris dialkylamino boranes

Reaction of tris(dialkylamino)boranes with ketones to give enamines [163]. 

The mechanisms of these exchange reactions as well as of the related exchanges with boron halides, tris(dialkylamino)boranes, and boron alkyls has been interpreted to proceed through a four-center transition state (255, 258, 260). 

Without additional reagents Reactions with tris(dialkylamino)boranes Carboxylic acid amides from carboxylic acids Enamines from ketones... 

Borazines of the types 40 [43], 41 [44], 42, and 43 as well as an isomer of 42 (having the sequence NCHiCHgjCHgO instead of N(CH2)30) [43] have been prepared from tris(dialkylamino)-boranes and ethylenediamine or propanediamine derivatives or aminoalkanols in aromatic solvents mass spectral and IR data are given [43, 44]. 41 is used for the preparation of semiconducting, amorphous BNC films (by pyrolysis on various substrates) [44]. 

D. T. Haworth. Tris(dialkylamino)boranes. Inorg. Synth., 1977,17,159. 

Acyloxy)dialkylboranes are best prepared from carboxylic acids with tri-alkylboranes.1,12-16 Other methods involve reactions of halodiorganobo-ranes with carboxylic acids17 or with acetic anhydride.18 Alternative syntheses from acetic anhydride using dialkyl(alkylthio)boranes or dialkylamino compounds have also been described.19... 

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