Interaction of 4-methyl-Δ3-thiachromene with polyphosphoric acid (PPA) yields 4-methylthiachroman and a blue thiacyanine dye. The latter is formed from 4-methylthianaphthalenium salt as a precursor.
A simple and green procedure for the conjugate addition of thiols to conjugated alkenes employing polyethylene glycol (PEG) as an efficient recyclable medium
作者:Ahmed Kamal、D. Rajasekhar Reddy、Rajendar
DOI:10.1016/j.tetlet.2005.09.082
日期:2005.11
Polyethylene glycol (PEG) is found to be an inexpensive, nontoxic, environmentally friendly reaction medium for the conjugate addition of thiols to conjugated alkenes to afford the corresponding adducts in excellent yields under mild and neutral conditions. Products of undesirable side reactions resulting from polymerization are not observed. The use of PEG avoids the use of either acid or base catalysts for this conversion and moreover PEG can be recovered and reused. (c) 2005 Elsevier Ltd. All rights reserved.
Efficient and reusable ionic liquid stabilized magnetic cobalt nanoparticles as catalysts for aza- and thia-Michael reactions
作者:Manika Dewan、Arnab De、Subho Mozumdar
DOI:10.1016/j.inoche.2015.01.027
日期:2015.3
Study of the Michael addition of β-cyclodextrin–thiol complexes to conjugated alkenes in water
An environmentally benign and highly efficient supramolecular Michael addition of thiols from the secondary side of beta-cyclodextrin to alpha,beta-unsaturated compounds at the primary side in water is described in quantitative yields; products of undesirable side reactions resulting from polymerization are not observed; the use of cyclodextrin precludes the use of either acid or base and the catalyst