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NHERI TallWood 10-story Test Nonstructural, Part 4 of 4: Prefabricated Steel Stair Subassemblies
- Award ID(s):
- 1635363
- Publication Date:
- NSF-PAR ID:
- 10348730
- Journal Name:
- 12th National Conference on Earthquake Engineering
- Sponsoring Org:
- National Science Foundation
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Brønsted acid catalyzed formal [4 + 4]-, [4 + 3]-, and [4 + 2]-cycloadditions of donor–acceptor cyclobutenes, cyclopropenes, and siloxyalkynes with benzopyrylium ions are reported. [4 + 2]-cyclization/deMayo-type ring-extension cascade processes produce highly functionalized benzocyclooctatrienes, benzocycloheptatrienes, and 2-naphthols in good to excellent yields and selectivities. Moreover, the optical purity of reactant donor–acceptor cyclobutenes is fully retained during the cascade. The 1,3-dicarbonyl product framework of the reaction products provides opportunities for salen-type ligand syntheses and the construction of fused pyrazoles and isoxazoles that reveal a novel rotamer-diastereoisomerism.