title: Lithium alkyl assisted coupling of a 2-cyano-2,3-dihydro-1H-1,3,2-diazaborole to give tBuNCH=CHN(tBu)BC(iPr)=N-BN(tBu)CH=CHNtBu.
abstract: Reaction of 2-cyano-1,3,2-diazaborole tBuNCH=CHN(tBu)BCN (2) with half an equivalent of isopropyllithium afforded compound tBuNCH=CHN(tBu)BC(iPr=N-BN(tBu)CH=CHNtBu (7). In contrast to this, a 1:1 stoichiometry of the reactants led to tBuNCH=CHN(tBu)BiPr (6) as the product of a nucleophilic substitution process at the boron atom. Similarly, regardless of the molar ratio of reactants employed, treatment of 2 with cyclopropyllithium, isobutyllithium or phenyllithium afforded solely substitution products tBuNCH=CHN(tBu)BR [R =cPr (12); Ph (13); iBu (14)].
authors.affiliation: Fakultät für Chemie der Universitat Bielefeld, Universitätsstr. 25, D-33615, Bielefeld, Germany. lothar.weber@uni-bielefeld.de
authors.forename: Lothar
authors.initials: L
authors.lastname: Weber
authors.forename: Imme
authors.initials: I
authors.lastname: Domke
authors.forename: Andreas
authors.initials: A
authors.lastname: Rausch
authors.forename: Anna
authors.initials: A
authors.lastname: Chrostowska
authors.forename: Alain
authors.initials: A
authors.lastname: Dargelos