Gmelin Handbook: B: B-Verb.14, 3.14.2, page 145 - 147
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Evers, E. C.; Freitag, W. O.; Keith, J. N.; Kriner, W. A.; McDiarmid, A. g.; Suyishi, S.
C. A., PB-143047 (1958) 1/17 1961 , p. 20919
introduction of BF3 into (CH3)2BN(C2H5)2 at 70°C as long as it is absorbed, (CH3)2BF escaping through reflux condenser, condensed at -78°C, end of react. indicated by escaping of BF3, ((C2H5)2NBF2)2 retained in reflux condenser;
