{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T04:18:45Z","timestamp":1768623525620,"version":"3.49.0"},"reference-count":60,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2020,1,9]],"date-time":"2020-01-09T00:00:00Z","timestamp":1578528000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["CHE1855681"],"award-info":[{"award-number":["CHE1855681"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Synthesis of new chromium(II) complexes with chelating bis(alkoxide) ligand [OO]Ph (H2[OO]Ph = [1,1\u2032:4\u2032,1\u2032\u2019-terphenyl]-2,2\u2032\u2019-diylbis(diphenylmethanol)) and their subsequent reactivity in the context of catalytic production of carbodiimides from azides and isocyanides are described. Two different Cr(II) complexes are obtained, as a function of the crystallization solvent: mononuclear Cr[OO]Ph(THF)2 (in toluene\/THF, THF = tetrahydrofuran) and dinuclear Cr2([OO]Ph)2 (in CH2Cl2\/THF). The electronic structure and bonding in Cr[OO]Ph(THF)2 were probed by density functional theory calculations. Isolated Cr2([OO]Ph)2 undergoes facile reaction with 4-MeC6H4N3, 4-MeOC6H4N3, or 3,5-Me2C6H3N3 to yield diamagnetic Cr(VI) bis(imido) complexes; a structure of Cr[OO]Ph(N(4-MeC6H4))2 was confirmed by X-ray crystallography. The reaction of Cr2([OO]Ph)2 with bulkier azides N3R (MesN3, AdN3) forms paramagnetic products, formulated as Cr[OO]Ph(NR). The attempted formation of a Cr\u2013alkylidene complex (using N2CPh2) instead forms chromium(VI) bis(diphenylmethylenehydrazido) complex Cr[OO]Ph(NNCPh2)2. Catalytic formation of carbodiimides was investigated for the azide\/isocyanide mixtures containing various aryl azides and isocyanides. The formation of carbodiimides was found to depend on the nature of organoazide: whereas bulky mesitylazide led to the formation of carbodiimides with all isocyanides, no carbodiimide formation was observed for 3,5-dimethylphenylazide or 4-methylphenylazide. Treatment of Cr2([OO]Ph)2 or H2[OO]Ph with NO+ leads to the formation of [1,2-b]-dihydroindenofluorene, likely obtained via carbocation-mediated cyclization of the ligand.<\/jats:p>","DOI":"10.3390\/molecules25020273","type":"journal-article","created":{"date-parts":[[2020,1,10]],"date-time":"2020-01-10T04:06:51Z","timestamp":1578629211000},"page":"273","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Synthesis of Chromium(II) Complexes with Chelating Bis(alkoxide) Ligand and Their Reactions with Organoazides and Diazoalkanes"],"prefix":"10.3390","volume":"25","author":[{"given":"Sudheer S.","family":"Kurup","sequence":"first","affiliation":[{"name":"Department of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2760-769X","authenticated-orcid":false,"given":"Richard J.","family":"Staples","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Michigan State University, 578 S Shaw Ln, East Lansing, MI 48824, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6692-0369","authenticated-orcid":false,"given":"Richard L.","family":"Lord","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Grand Valley State University, 1 Campus Dr, Allendale, MI 49401, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3578-7985","authenticated-orcid":false,"given":"Stanislav","family":"Groysman","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1267","DOI":"10.1055\/s-0031-1290977","article-title":"Atom-Economical C2 + N1 aziridination: Progress towards catalytic intermolecular reactions using alkenes and aryl azides","volume":"23","author":"Jenkins","year":"2012","journal-title":"Synlett"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3831","DOI":"10.1039\/c005219c","article-title":"Recent advances in transition metal-catalyzed N-Atom transfer reactions of azides","volume":"8","author":"Driver","year":"2010","journal-title":"Org. 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