Facile and Reliable Synthesis of Tetraphenoxyborates and Their Properties
作者:Itamar M. Malkowsky、Roland Fröhlich、Ulrich Griesbach、Hermann Pütter、Siegfried R. Waldvogel
DOI:10.1002/ejic.200600074
日期:2006.4
Tetraphenoxyborates are reliably prepared in a two-step sequence, exploiting less corrosive reagents like boric acid and the corresponding phenols. The broad scope of this transformation is demonstrated in 22 examples. Several solid-state structures reveal the preferential conformation of the phenoxy moieties allowing cation interaction. Furthermore, a novel architecture of a phenoxy-substituted tetraborate
Various mesityl, alkoxy and aryloxy-stibanes were prepared from the corresponding mesitylchlorostibanes. The reaction of the same mesitylchlorostibanes with the 3,5-di-t-butyl catechol first leads to the formation of a Sb V complex observed by LH NMR. Depending on the experimental conditions the reaction can fork from this intermediate. Intramolecular hydrochloride elimination when this is trapped using a tertiary amine, leads to 2-mesityl- 1,3-dioxa-4,6-di-t-butylbenzo-2-stibolane while the absence of a tertiary amine allows an acidic cleavage of the mesityl-antimony bond with formation of 2-chloro-1,3-dioxa-4,6-di-t-butylbenzo-2-stibolane.