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We report the first Co(II) catalyzed one\u2010component one\u2010pot sustainable synthesis of acyl hydrazones only from acyl hydrazides under mild reaction conditions. Traditional and contemporary methodologies use two components (usually acyl hydrazides and aldehydes\/ketones\/alcohols\/styrene) as the coupling partners. Our protocol, on the other hand, involves the <jats:italic>in\u2005situ<\/jats:italic> generation of aldehyde intermediate (detected by gas chromatography) from the acyl hydrazide, which then undergoes condensation with another molecule of the same acyl hydrazide in the same pot to yield acyl hydrazones in presence of mild base K<jats:sub>2<\/jats:sub>CO<jats:sub>3<\/jats:sub> and low\u2010cost Co(OAc)<jats:sub>2<\/jats:sub>\u2009\u22c5\u20094H<jats:sub>2<\/jats:sub>O as catalyst. This method shows good functional group tolerance with good to excellent yield of products. Furthermore, some of the resulting acyl hydrazones have been used as synthetic precursors and explored in various post\u2010synthetic modifications to afford <jats:italic>N<\/jats:italic>\u2010heterocyclic compounds. Furthermore, photoswitchable properties of few synthesized acyl hydrazones are also explored using their <jats:italic>E\/Z<\/jats:italic> isomerization around the C=N bond, as realized by high\u2010pressure liquid chromatography (HPLC) and UV\u2010vis spectroscopic studies.<\/jats:p>","DOI":"10.1002\/asia.202300755","type":"journal-article","created":{"date-parts":[[2023,10,10]],"date-time":"2023-10-10T02:45:12Z","timestamp":1696905912000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Co(II) Acetate\u2010Assisted Direct Synthesis of Acyl Hydrazones from Acyl Hydrazides under Mild Conditions"],"prefix":"10.1002","volume":"18","author":[{"given":"Adwitiya","family":"Pal","sequence":"first","affiliation":[{"name":"Department of Chemistry Jadavpur University  Kolkata 700032 West Bengal India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Krishna 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