N-Heterocycle-Ligated Borocations as Highly Tunable Carbon Lewis Acids
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چکیده
منابع مشابه
N-Heterocycle-Ligated Borocations as Highly Tunable Carbon Lewis Acids
The relative (to BEt3) hydride ion affinity (HIA) of a series of acridine borenium salts has been calculated, with some HIAs found to be similar to that for [Ph3C]+. The HIA at the acridine C9 position is controlled by both acridine and the boron substituents, the latter presumably affecting the strength of the B=N bond in the acridane-BY2 products from hydride transfer. Through a range of hydr...
متن کاملN‐Methyl‐Benzothiazolium Salts as Carbon Lewis Acids for Si−H σ‐Bond Activation and Catalytic (De)hydrosilylation
N-Me-Benzothiazolium salts are introduced as a new family of Lewis acids able to activate Si-H σ bonds. These carbon-centred Lewis acids were demonstrated to have comparable Lewis acidity towards hydride as found for the triarylboranes widely used in Si-H σ-bond activation. However, they display low Lewis acidity towards hard Lewis bases such as Et3 PO and H2 O in contrast to triarylboranes. Th...
متن کاملSynthesis of a diboryl-N-heterocycle and its conversion to a bidentate cationic Lewis acid.
Sequential reaction of 2-lithio-1-methylimidazole with 9-borabicyclo[3.3.1]nonane (9-BBN) dimer and 9-Cl-9-BBN yields diboryl-N-heterocycle C4H5N2(H)(BC8H14)2 (1). Reaction of 1 with I2 results in the net substitution of chelated hydride for a singly boron-bound iodide to produce C4H5N2(I)(BC8H14)2 (2). Conversely, reaction of 1 with [Ph3C][B(C6F5)4] results in the formation of the bidentate ca...
متن کاملSynthesis and reactivity of N,N'-1,4-diazabutadiene derived borocations.
A series of borocations have been synthesised from the addition of haloboranes to synthetically accessible N,N'-1,4-diazabutadiene precursors, which are derived from commercially available anilines. The synthesis and structural studies of the borocations are described.
متن کاملComplete reductive cleavage of CO facilitated by highly electrophilic borocations.
The addition of CO to [((R3N)BH2)2(μ-H)][B(C6F5)4] leads to formation of trimethylboroxine ((MeBO)3) and [(R3N)2BH2][B(C6F5)4]. When R = Et, [(Et3N)H2B(μ-O)B(CH3)NEt3][B(C6F5)4], is isolated and demonstrated to be an intermediate in the formation of (MeBO)3.
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ژورنال
عنوان ژورنال: Organometallics
سال: 2017
ISSN: 0276-7333,1520-6041
DOI: 10.1021/acs.organomet.7b00779