The Aminolysis of Beryllium Dichloride with Diisopropylamine and Reactions of Some Aminoberyllium Chlorides

BeCl 2 is not aminolyzed by diisopropylamine. An excess of this amine reacts with BeCl 2 or BeCl 2 ·2OEt 2 to give BeCl 2 ·HN i Pr 2 ( 1 ). This compound, on deprotonation with LiBu at low temperature, gives rise predominantly to dimers of ClBe(N i Pr 2 ) ( 2 ), together with Be(N i Pr 2 ) 2 ( 3 ). Compound 2 adds diisopropylamine to give the adduct ClBe(N i Pr 2 )·HN i Pr 2 ( 4 ), which provides 3 on treatment with LiBu. Compound 2 reacts with LiBH 4 to give dimeric i Pr 2 NBeBH 4 ( 17 ). The BH 4 group is μ 2 ‐bonded to the Be centers, as shown by NMR spectroscopic data and an X‐ray structure determination. Moreover, a number of dimeric organylberyllium diisopropylamides i Pr 2 NBeR have been prepared by treatment of 2 with LiR. In analogy, tert ‐butoxyberyllium diisopropylamide ( 20 ) has also been synthesized. Moreover, several 2,2,6,6‐tetramethylpiperidinoberyllium and bis(trimethylsilyl)amino derivatives are reported. 9 Be NMR spectroscopic data of the new compounds are consistent with tricoordinated Be centers and dimeric units (MS, cryoscopy). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)