Developing selective polymerizations from complex monomer mixtures is an important challenge. Here, dinuclear catalysts allow selective polymerization from mixtures of sterically hindered tricyclic anhydrides, carbon dioxide and epoxides to yield well-controlled copoly(ester-carbonates). Surprisingly, two very similar homogeneous catalysts differing only in the central metal, zinc versus magnes...

The unsaturated fatty acid maleinization reaction was adopted according to the well documented procedures of synthesizing the alkenyl succinic anhydrides (ASA) that are often used in industry (i.e. for paper sizing agents and cutting fluids lubricants) . For monounsaturated fatty acid such as oleic acid, 13 times of maleic anhydride to oleic acid molar ratio are recommended to obtain high yield...

The compounds containing the complex ion or complex molecule in which central metal atom or ion is surrounded by a number of oppositely charged ions or molecules are known as co-ordination compounds [1], complex compound or simply complex. Coordination basically refers to the "coordinate covalent bonds" (dipolar bonds) between the ligands and the central atom in 1914, when first coordination co...

Sulfone-substituted γ- and δ-lactams have been prepared in a single step with high diastereoselectivity. Sulfonylglutaric anhydrides produce intermediates that readily decarboxylate to provide δ-lactams with high diastereoselectivity. Substituents at the 3- or 4-position of the glutaric anhydride induce high levels of stereocontrol. Sulfonylsuccinic anhydrides produce intermediate carboxylic ac...

PURPOSE To synthesize a new series of 5-substituted-3-methylsulfanyl-1H-pyrazole-4-carboxylic acid ethyl esters for their analgesic and anti-inflammatory activity. METHODS The title compound synthesized by reacting the amino group of 5-amino-3-methylsulfanyl-1H-pyrazole-4-carboxylic acid ethyl ester with acid anhydrides, acid chlorides and phenyl dithiocarbamates. The synthesized compounds we...

We report a new synthetic methodology for poly(ester amide)s by anionic ring-opening copolymerization of N-sulfonyl aziridines and cyclic anhydrides. Phosphazenes organocatalysts have been found to promote highly-active, controlled, selective alternating in the absence any competitive side reaction (zwitterionic mechanism exchange transacylations). Mechanistic studies shown first-order dependen...