Tripyridylcyclopropene derivatives and their conversion to hexapyridylbenzene
摘要:
1,2,3-tris(4-pyridyl)cyclopropene carrying a 3-benzenesulfonyl group has been synthesized, and other cyclopropenes carrying pyridine and pyridinium rings. Some of these can be converted to hexa(4-pyridyl)benzene and its pyridinium analog.
Efficient New Protocol to Synthesize Aromatic and Heteroaromatic Dithioesters
作者:Serge Masson、Isabelle Abrunhosa、Mihaela Gulea
DOI:10.1055/s-2004-822311
日期:——
A very efficient, high yielding procedure to synthesize substituted aromatic and heteroaromatic dithioesters is described. It involves the reaction between (phenylsulfonyl)methyl (hetero)aromatic derivatives and elemental sulfur in basic medium, followed by alkylation.
A Multidisciplinary Approach to the Use of Pyridinyl Dithioesters and Their <i>N</i>-Oxides as CTAs in the RAFT Polymerization of Styrene. Not the Chronicle of a Failure Foretold
of the dormant radical species intermediate in the RAFT process by the heteroaromatic rings as inferred from the measured reduction potentials of the compounds. Styrene polymerization was actually blocked at very low conversion in the case of the dithioisonicotinate N-oxide, and on the basis of ESR (electronspinresonance) studies it is suggested that in this case the dormant radical may actually act
Vicarious nucleophilic substitution using chloromethyl phenyl sulfone was applied to pyridinium and 1, 2, 3-triazinium dicyanomethylides to afford corresponding 4-substituted pyiridinium and 5-substituted triazinium dicyanomethylides, respectively. They were readily transformed to 4-phenylsulfonylmethylpyridines and 5-phenylsulfonylmethyltriazines by radical reaction.
Palladium-catalyzed Negishi α-arylation of alkylsulfones
作者:Gang Zhou、Pauline C. Ting、Robert G. Aslanian
DOI:10.1016/j.tetlet.2009.12.035
日期:2010.2
A general, mild catalytic system for alpha-monoarylation of various alkyl sulfones is described that utilizes palladium-catalyzed Negishi cross-coupling approach. Published by Elsevier Ltd.