期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 132, 期 34, 页码 11952-11966出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja102848z
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资金
- National Science Foundation [CHE-0449845, CHE-030089, CHE0910597]
- ACS Division of Organic Chemistry and Organic Syntheses
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0910597, GRANTS:13818903] Funding Source: National Science Foundation
Intramolecular [2 + 2] cycloaddition reactions of allene-ynes offer a quick and efficient route to fused bicyclic ring structures. Insights into the mechanism and regiochemical preferences of this reaction are provided herein on the basis of the results of quantum chemical calculations (B3LYP/6-31 +G(d,p)) and select experiments; both indicate that the reaction likely proceeds through a stepwise diradical pathway where one radical center is stabilized through allylic delocalization. The influences of the length of the tether connecting the alkyne and allene and substituent effects are also discussed.
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