Title: Deformation mechanisms of gamma'/gamma" co-precipitates in IN718
Award ID(s):
1922239
PAR ID:
10191750
Author(s) / Creator(s):
Date Published:
Journal Name:
Superalloys 2020
Volume:
2020
Page Range / eLocation ID:
669-679
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. Abstract We report the oxidative dimerization reaction of siloxydienes derived from simple enones that creates a new gamma‐gamma (γ‐γ) C−C bond using catalytic iron and benzoyl peroxide as the terminal oxidant in acetonitrile solvent at ambient temperature. The reaction shows a broad substrate scope including cyclic and acyclic siloxydienes derived from ketones, aldehydes, and esters, which are converted to 1,8‐dicarbonyl compounds under mild catalytic reaction conditions in 19–89 % yield across 30 examples. The method is suitable for the coupling of sterically demanding carbon centers, including the formation of vicinal quaternary centers. Conceptually, the dienol ether serves as a precursor to a conjugated radical cation, which undergoes highly site selective γ‐dimerization reactions. The γ‐γ dimerization strategy is applied to the synthesis of a bioactive analogue of honokiol. 
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