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Title: NHERI TallWood 10-story Test Nonstructural, Part 4 of 4: Prefabricated Steel Stair Subassemblies
Award ID(s):
1635363
NSF-PAR ID:
10348730
Author(s) / Creator(s):
; ;
Date Published:
Journal Name:
12th National Conference on Earthquake Engineering
Format(s):
Medium: X
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. 
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