title: Active low-valent niobium catalysts from NbCl5 and hydrosilanes for selective intermolecular cycloadditions.
abstract: An active niobium catalyst was developed via a simple and nontoxic reduction method from NbCl(5)/hydrosilane and utilized for the selective [2 + 2 + 2] cycloaddition reaction of terminal alkynes and alkenes/α,ω-dienes, to give 1,3-cyclohexadiene derivatives in high yields with excellent chemo- and regioselectivity.
authors.affiliation: Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Osaka 564-8680, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Satoh
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Obora