34574-27-1Relevant articles and documents
Pyrazole complexes of acyloxydialkylboranes
Dabrowski, Marek,Klis, Tomasz,Lulinski, Sergiusz,Madura, Izabela,Serwatowski, Janusz,Zachara, Janusz
, p. 31 - 37 (1998)
The reaction of Me3CCOOBEt2 with pyrazole led to the formation of the stable addition complex 1, which was found to be monomeric in solution. The reaction of 9-H-9-borabicyclo[3.3.1]nonane (9-H-9-BBN)2 with pyrazole and pivalic acid yielded a similar complex Me3CCOO(9-BBN)-pzH 2. Crystallographic analysis of 2 revealed a dimeric structure due to the strong hydrogen bonding between azole hydrogen and carbonyl oxygen. The one boron-carbon bond of compound 1 cleaves readily with triethylborane at 20°C with the evolution of ethane, giving a species Me3CCOO(BEt2)2pz 3 with a seven-membered heterocyclic ring as the main structural feature.