Pyrazole complexes of acyloxydialkylboranes
Marek Da̧browski , Tomasz Kliś , Sergiusz Luliński , Izabela Madura , Janusz Serwatowski , Janusz Zachara
AbstractThe 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.
|Journal series||Journal of Organometallic Chemistry, ISSN 0022-328X|
|Keywords in English||Acyloxyboranes, Crystal structure, NMR spectroscopy, Pyrazaboles, Pyrazole|
|Publication indicators||: 2006 = 2.332 (2) - 2007=2.097 (5)|
|Citation count*||8 (2015-04-26)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.