title: Pericyclic Reactions of Free and Complexed Cyclopentyne.
abstract: The selectivity between [2 + 2] and [2 + 4] cycloadditions of cyclopentyne with spiro[2.4]nona-2,4-diene depends on the mode of generating the cycloalkyne. Using diazomethylenecyclobutane and (bromocyclobutylidenemethyl)trimethylsilane as precursors affords cyclopentyne in an unencumbered form, whereas using dibromomethylenecyclobutane and 1,2-dibromocyclopentene yields a cyclopentyne-lithium bromide complex.
authors.affiliation: Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712.
authors.forename: John C.
authors.initials: JC
authors.lastname: Gilbert
authors.forename: Duen-Ren
authors.initials: DR
authors.lastname: Hou
authors.forename: Julian W.
authors.initials: JW
authors.lastname: Grimme