{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T22:51:47Z","timestamp":1770331907968,"version":"3.49.0"},"reference-count":23,"publisher":"International Union of Crystallography (IUCr)","issue":"2","license":[{"start":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T00:00:00Z","timestamp":1769126400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T00:00:00Z","timestamp":1769126400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"}],"funder":[{"name":"European Union-Next Generation EU","award":["P2022WXPMB"],"award-info":[{"award-number":["P2022WXPMB"]}]}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr E Cryst Commun","Acta Cryst E","Acta Cryst Sect E","Acta Crystallogr E","Acta Crystallogr Sect E","Acta Cryst E Cryst Commun","Acta Cryst Sect E Cryst Commun"],"accepted":{"date-parts":[[2026,1,21]]},"published-print":{"date-parts":[[2026,2,1]]},"abstract":"<jats:p>\n                    The title compound, C\n                    <jats:sub>19<\/jats:sub>\n                    H\n                    <jats:sub>16<\/jats:sub>\n                    N\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    , was the unexpected product of the Knoevenagel condensation between 2,6-dimethyl-\u03b3-pyrone and cyanoacetic acid in the presence of acetic anhydride and piperidine as catalyst. The molecule is formed by two almost planar 2,6-dimethyl-4\n                    <jats:italic>H<\/jats:italic>\n                    -pyran-4-cyanoylidene halves connected by the central carbonyl group. The two halves are not coplanar, the dihedral angle between their planes being 47.51\u2005(3)\u00b0. The packing shows the formation of (001) sheets of molecules held together by weak C\u2014H...N and C\u2014H...O hydrogen bonds. A mechanism for the reaction is proposed.\n                  <\/jats:p>","DOI":"10.1107\/s2056989026000587","type":"journal-article","created":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T09:22:03Z","timestamp":1769073723000},"page":"204-207","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Synthesis and structure of 2,4-bis(2,6-dimethyl-4\n                    <i>H<\/i>\n                    -pyran-4-ylidene)-3-oxopentanedinitrile, an unexpected product of a Knoevenagel condensation reaction"],"prefix":"10.1107","volume":"82","author":[{"given":"Antonio","family":"Carella","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9413-1372","authenticated-orcid":true,"given":"Emmanuele","family":"Parisi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vincenzo","family":"Piccialli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roberto","family":"Centore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2026,1,23]]},"reference":[{"key":"hb8188_bb1","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1107\/S0021889898007717","volume":"32","author":"Altomare","year":"1999","journal-title":"J. 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