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This is the peer reviewed version of the following article: J. A. González, F. Verdugo, J. L. Mascareñas, F. López, C. Nevado, Angew. Chem. Int. Ed. 2020, 59, 20049, which has been published in final form at https://doi.org/10.1002/anie.202007371. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. ; Pyridine‐substituted alkylidenecyclopropanes (Py‐ACPs) react with gold(III) salts under mild reaction conditions through an unprecedented, proximal ring‐opening pathway, to generate highly appealing, catalytically active pyridine alkenyl [C^N]‐gold(III) species. Mechanistic studies reveal that the activation of the C−C bond of the ACP takes place through an unusual concerted, σ‐bond metathesis type‐process ; We thank the European Research Council (ERC Starting grant agreement no. 307948, and Advanced Grant 340055), the Swiss National Science Foundation (SNF 200020_146853), the Legerlotz Stiftung the MINECO (SAF2016‐76689‐R, CTQ2017‐84767‐P), the Xunta de Galicia (2015‐CP082, ED431C 2017/19, and Centro singular de investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the European Union (European Regional Development Fund—ERDF) for financial support and the STSM Grant to F. Verdugo from COST Action CA15106 ; SI

Frontmatter -- ACKNOWLEDGEMENTS -- INDEX -- Contents -- Introduction -- Introductory Interview: Returning to the Roots -- Initial Thoughts: Make the Invisible Visible -- Foreword: The Community -- Editorial An Urban Trend: Residents Taking Ownership of their Environment -- Five Cities -- Introduction to Five Cities -- Mumbai -- São Paulo -- Istanbul -- Mexico City -- Cape Town -- Common Points -- Four Interviews: Five Cities, One Gaze -- The Significance of Space in Urban Society -- Reporting from Local Initiatives -- Cities are an Expression of Human Needs -- Focus on Results: Attention to Real Needs -- Project Categories, Programs and Common Clouds -- Final Considerations -- Credits -- IMPRINT