A catalyst composed of [Pd(η(3)-C3H5)Cl]2 and N,N,N',N'-tetra(diphenylphosphinomethyl)pyridine-2,6-diamine (L) was found to be effective for one-pot synthesis of 2-substituted benzo[b]furans from 2-halophenols and alkynes. For 2-bromo-3-hydroxypyridine, the catalyst loading could be as low as 1 ppm and the turnover number (TON) was up to 870,000.
A green, efficient and controllable transformation between sulfonyl hydrazides and alkynes leading to benzo[b]thiophene-1,1-dioxides and (E)b-iodo vinylsulfones via radical pathway has been developed. The reaction occurs rapidly in the presence of simply H 2 O 2 and KI without the help of any transition metal. The chemoselectivity of the reaction is determined by the solvent in which the process is performed: TFE favors the cyclic product, while H 2 O medium generates the iodosulfonylative product. Notably, this protocol also represents the first direct approach to the aggregationinduced-emmision (AIE) active benzo[b] thiophene-1,1-dioxides from readily available sulfonyl hydrazides and alkynes in one step.
Crystal structures of multivalent metal amidoboranes (CaAB, MgAB, AlAB) with their thermodynamic properties and dehydrogenation mechanisms have been obtained theoretically.
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