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An unprecedented sulfenylation reaction of carbon-boron bonds has been developed using sulfonyl hydrazides as sulfenyl sources. A range of sulfonyl hydrazides underwent tetrakis(acetonitrile) copper(I) tetrafluoroborate [Cu(CH3CN)4BF4]/2,2'-bipyridine-catalyzed sulfenylation with boronic acids under air to give structurally diverse thioethers in moderate to good yields. Preliminary mechanistic studies show that sulfonyl hydrazides are subjected to decomposition into thiosulfonates and disulfides followed by formation of carbon-sulfur bonds with boronic acids. [ABSTRACT FROM AUTHOR]

We propose a catalytic mechanismfor the cycloaddition of epoxideto carbon dioxide catalyzed by salen-M (M = Co, Zn, Al) based on densityfunctional theory calculations. The catalytic reaction follows a single-sitemechanism rather than a bimetallic-site mechanism, which includesfour steps: epoxide adsorption by salen-M, ring opening of epoxide,CO2insertion, and intramolecular rearrangement. Our calculationresults showed that the highest reaction barrier for salen-Co catalystis only 9.94 kcal/mol, which is lower than that of salen-Al (14.38kcal/mol) and salen-Zn (13.05 kcal/mol). The results indicate thatthe reaction catalyzed by salen-Al, salen-Co, or salen-Zn can occurat room temperature and atmospheric pressure, which is in agreementwith experimental results. The mechanism can be used for the designof a novel catalyst for this reaction. [ABSTRACT FROM AUTHOR]

An unprecedented sulfenylation reaction of boronic acids is investigated. [ABSTRACT FROM AUTHOR]

The catalyst is reused for more than ten times without significant loss of its catalytic activity. [ABSTRACT FROM AUTHOR]

The three-component oxysulfenylation fails with acyclic 1,2-disubstituted alkenes such as (E)-stilbene and 2-methyl-1-phenyl-1-propene. [ABSTRACT FROM AUTHOR]