Amine adducts of bis(trifluoromethyl)borane, (CF3)2BH, crystal and molecular structure of (CF3)2BH*NMe2CH2Ph

Article abstract of DOI:10.1016/0022-328X(94)05036-B

Trialkylstannanes R3SnH (R = Me, Bu) and 9-BBN add to the B=N double bond in dimethylaminobis(trifluoromethyl)borane (CF3)2B=NMe2 (A) to yield (CF3)2BH*NMe2SnR3 and (CF3)2BH*NMe2-9-BBN respectively.Both hydrolyse to yield the dimethylamine adduct of bis(trifluoromethyl)borane (CF3)2BH*NHMe2 (I).Treatment of I with KOH in ether gave the salt K<(CF3)2BHNMe2> (Ia).The nitrogen in Ia has been alkylated with CH3I, ClCH2Ph, ClCH2CH=CH2 and BrCH2C<*>CH to yield the respective amine boranes (CF3)2BH*NMe3 (II), (CF3)2BH*NMe2CH2Ph (III), (CF3)2BH*NMe2CH2CH=CH2 (IV) and(CF3)2BH*NMe2CH2C<*>CH (V), whereas ring opening of 2-phenyloxirane led to (CF3)2BH*NMe2CH2CH(OH)C6H5 (VI).I-VI have been characterised by elemental analyses, mass, IR and multinuclear NMR spectroscopy, and the crystal structure of III has been determined by X-ray methods.Keywords: Adducts; Bis(trifluoromethyl)borane; X-ray