The ligands N-salicylidene-o-aminophenol (LH2), N-(5-chiorosalicylidene)-o-aminophenol (L(Cl)H2, and N-(5-bromosalicylidene)-o-aminophenol (L(Br)H2) were used to prepare a series of borates having the formulas LBOR (R = Me (1), Et (2), nPr (3), nBu (4)), L(Cl)BOR (R = Me (5), Et (6), nPr (7), nBu (8)), and L(Br)BOR (R = Me (9), Et (10), nPr (11), nBu (12)). Either 1-4 or 9-12 could be combined with HOSiPh3, to form unique compounds possessing a single B-O-Si linkage, LBOSiPh3 (13) and L(Br)BOSiPh3 (14), respectively. The charged species, [LB(thf)]+OTf- (15) forms when 1 is combined with HOTf. It can be used as a catalyst for the oligomerization of propylene oxide. By comparison, [nBu2B]+OTf- effects the oligomerization to the same extent as 15, but the neutral species, 1-4, 13, and 14 do not, even under forcing conditions. All of the compounds were characterized by melting point, 1H NMR, IR, elemental analyses, and, in the case of 13, by X-ray crystallography.
|Number of pages||5|
|State||Published - 1998|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry