group assisted C–H activation with maleimides leading to novel and switchable decarboxylative Heck-type and [4 + 1] annulation products catalyzed by Rh(III) has been reported. In these reactions, solvents play a vital role in switching the selectivity. An aprotic solvent, THF, leads to the decarboxylative Heck-type product while the protic solvent, TFE, results in the [4 + 1] annulation product. The
A catalytic oxidative carbonylation reaction was developed for the synthesis of polysubstituted maleimides from alkynes and amines with air as a green oxidant. This novel transformation proceeds in the presence of palladium chloride without the need for expensive ligands or additives and has a broad substrate scope affording a variety of maleimides in good to high yields.
An efficient nano-Cu2O-catalyzed cascade multicomponent reaction of 2-halobenzoic acids and trimethylsilyl cyanide with diverse amines was developed using water as a solvent, affording versatile N-substituted phthalimide derivatives in moderate to excellent yields. This novel strategy features carbon monoxide gas-free, environmentallybenign, one-pot multistep transformation, commercially available
Carboamination and olefination: <i>ortho</i> C–H functionalization of phenoxyacetamide
作者:Tanmayee Nanda、Shubham Kumar Dhal、Gopal Krushna Das Adhikari、Namrata Prusty、Ponneri C. Ravikumar
DOI:10.1039/d3cc02202a
日期:——
A rhodium-catalyzed carboamination of olefin with the retention of double bond has been demonstrated. A deacylative carboamination of the maleimide has been achieved. In addition to carboamination, we have also disclosed ortho C–H olefination of phenoxyacetamides.
The present invention relates to resin compositions adapted for weather, heat and light resistance, and which are also resistant to discolouration, comprising at least one polymeric substance and:
(A) a hindered amine stabiliser;
(B) a hindered-phenol-hindered amine stabiliser; and
(C) a UV absorber,
in amounts sufficient to confer resistance to discolouration on the composition.