Reaction of 2-Aroylmethylenemalonates with Corey Ylide

Reaction of Corey ylide with α,β-unsaturated ketones: tuning of chemoselectivity toward dihydrofuran synthesis.

A straightforward, efficient, and reliable approach to synthetically valuable 2,3-dihydrofurans via a reaction between Corey ylide and α,β-unsaturated ketones has been developed. The use of simple and widely spread starting materials as well as mild reaction conditions and scalability provide a broad scope of 2,3-dihydrofurans.

2-Thienylcarbonylmethylene–triphenylphosphorane ylide

In the mol-ecule of the title compound, (2-thienylcarbon-yl)(triphenyl-phospho-nio)methanide, C(24)H(19)OPS, the geometry around the P atom is nearly tetra-hedral and the O-C-C-P torsion angle is 2.80 (3)°. The thio-phene ring is twisted through an angle of 4.33 (4)° with respect to the plane of the carbonyl group. Inter- and intra-molecular hydrogen bonds and C-H⋯π inter-actions are present in...

Oxygen-sulfur rearrangement in the reaction of thiocarbamate imidazolium ylide with arylaldehyde.

The nucleophilic addition of thiocarbamate imidazolium ylide to aldehyde triggered sequential intramolecular N to O migration of thiocarbonyl amide group and reversible oxygen-sulfur rearrangement to afford 2-imidazolium alkylcarbamothioate. The ortho group on phenyl of aldehyde strongly affects the balance of the O- to S-rearrangement.

Robert Brainard Corey

Functionalization of Carboxylated Multi-Walled Nanotubes with Stabilised Phosphorus Ylide

In this paper, the chemical Functionalization of Carboxylate multi-walled carbon nanotubes by methyl (triphenyl phosphoranylidene) acetate have been investigated. Phosphorus Ylides are important compound in organic chemistry. At first, methyl (triphenyl phosphoranylidene) acetate, synthesized from salt metod in two steps: the formation of the phosphonium salt and the deprotonation of the latter...