Retraction of “Access to Cyclobutadienes via an Organocatalytic

Retraction Cite This: Org. Lett. XXXX, XXX, XXX−XXX

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Retraction of “Access to Cyclobutadienes via an Organocatalytic Dienamine−Iminium−Allenamine Cascade Approach” Wenjun Li, Ming Lang, and Jian Wang* Org. Lett. 2017, 19 (17), 4564−4567, DOI: 10.1021/acs.orglett.7b02161

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he authors retract this article on the basis that the reported cyclobutadiene structures are not fully supported by their 13C NMR data. Since publication, the authors were not able to obtain a crystal structure to clearly confirm the published work and rule out other plausible structures. The original article was published on August 17, 2017 and retracted on December 11, 2017.

Received: December 4, 2017

© XXXX American Chemical Society

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DOI: 10.1021/acs.orglett.7b03777 Org. Lett. XXXX, XXX, XXX−XXX