Three types of novel radical cyclization of 1,6-enynes with sulfonyl hydrazides have been presented, which provided convenient synthetic approaches for accessing five-membered cyclic lactams, five-membered cyclic lactams containing C–I bond, and six-membered cyclic lactams. Notably, these transformations are implemented in metal-catalyst-free systems, in which three classes of important lactam derivatives were synthesized with selectivity and controllability from the same substrate using water as the green solvent.

Two kinds of polyvinyl chloride (PVC)/organophilic montmorillonite (OMT) nanocomposites are prepared by a melt intercalation method. This study has been designed to determine if the presence of iron and zinc ions in the structure of montmorillonite (MMT) lattice can affect thermal, flame retardant and smoke suppressant properties. The information about the morphological structure of PVC/OMT nanocomposites was obtained using X-ray diffraction and transmission electron microscopy. The thermal and flame retardant properties of the nanocomposites were characterized by thermogravimetric analysis, limiting oxygen index and smoke density. The nanocomposites based on Fe-OMT exhibit better thermal, flame retardant properties and lower degradation degree than those of pure PVC. The degradation mechanism was studied by pyrolysis, gas chromatography and mass spectrometry (Py-GC-MS).

Iron-catalyzed oxidative cyclization of olefinic 1,3-dicarbonyls with ketone C(sp3)–H bonds through C-C and C-O bond formations has been described for the first time. A broad substrate scope and ease of...

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A novel polychloromethylation/acyloxylation of 1,6-enynes with chloroalkanes and diacyl peroxides through dual roles designs to prepare 2-pyrrolidinone derivatives with polychloromethyl units has been developed by the use of inexpensive copper...