Tuning the morphological and acidic properties of mesoporous molecular sieve materials is highly valuable for catalyst design towards reactions involving large molecules. In this work, a series Ga-containing SBA-15 ordered (OMMs) were synthesized following acid-free strategy. Ga-SBA-15 exhibits an acid amount 0.48 mmol/g, comparable to Al-SBA-15 (0.45 mmol/g). addition, it found that straight s...

Experimentally, a reversal of chemoselectivity has been observed in catalyzed Diels–Alder reactions α,β-unsaturated aldehydes (e.g., (2E)-but-2-enal) and ketones 2-hexen-4-one) with cyclopentadiene. Indeed, using the triflimidic Brønsted acid Tf2NH as catalyst, reaction gave adduct derived from ketone major product. On other hand, use tris(pentafluorophenyl)borane B(C6F5)3 bulky Lewis catalyst ...

Catalytic chemoselective reactions of innately less reactive functionalities over more are described. A cooperative catalyst comprising a soft Lewis acid/hard Brønsted base enabled activation hydroxyl group an amino group, allowing for nucleophilic addition to electron-deficient olefins. The reaction could be applicable variety alcohols, including pharmaceuticals, without requiring tedious prot...

Study of the kinetics of intramolecular aryl ether C-O bond cleavage by Ni was facilitated by access to a family of metal complexes supported by diphosphines with pendant aryl-methyl ethers. The nature of the aryl substituents was found to have little effect on the rate of cleavage. In contrast, soluble Lewis acidic additives accelerate the aryl ether cleavage dramatically. The effect of AlMe3 ...

Enantiopure secondary alcohols are fundamental high-value synthetic building blocks. One of the most attractive ways to get access this compound class is catalytic hydroboration. We describe a new concept for reaction type that allowed exceptional turnover numbers (up 15 400), which were increased by around 1.5–3 orders magnitude compared active catalysts previously reported. In our an aprotic ...

Study of the kinetics of intramolecular aryl ether C-O bond cleavage by Ni was facilitated by access to a family of metal complexes supported by diphosphines with pendant aryl-methyl ethers. The nature of the aryl substituents was found to have little effect on the rate of cleavage. In contrast, soluble Lewis acidic additives accelerate the aryl ether cleavage dramatically. The effect of AlMe3 ...

In the present work, impact of Lewis acid (LA) catalysts BF3, BCl3, and BBr3 on the kinetics andregioselectivity of 1,3-dipolar cycloaddition (1,3-DC) reaction between azidobenzene and acroleinwas theoretically studied using B3LYP/6-31G* level. Our results indicate while the uncatalyzed 1,3-DC reaction under investigation takes place via a non-polar, non-regioselective, and lowasynchronous proc...

A gallium-catalyzed C–H propargylation of electron-rich arenes using bromoallenes is described. The development this reaction was first hampered by a side hydroarylation process catalyzed adventitious protons, easily generated from the solvent (1,2-dichloroethane). This hidden Brønsted acid catalysis could be bypassed K2CO3 as an insoluble base. unexpected compatibility base with Lewis catalyst...