On February 21, 2020, Tang, Yidan; Meador, Rowan I. L.; Malinchak, Casina T.; Harrison, Emily E.; McCaskey, Kimberly A.; Hempel, Melanie C.; Funk, Timothy W. published an article.Electric Literature of 111-29-5 The title of the article was (Cyclopentadienone)iron-Catalyzed Transfer Dehydrogenation of Symmetrical and Unsymmetrical Diols to Lactones. And the article contained the following:
Air-stable iron carbonyl compounds bearing cyclopentadienone ligands with varying substitution were explored as catalysts in dehydrogenative diol lactonization reactions using acetone as both the solvent and hydrogen acceptor. Two catalysts with trimethylsilyl groups in the 2- and 5-positions, [2,5-(SiMe3)2-3,4-(CH2)4(η4-C4C=O)]Fe(CO)3 and [2,5-(SiMe3)2-3,4-(CH2)3(η4-C4C=O)]Fe(CO)3, were found to be the most active, with 2 being the most selective in the lactonization of diols containing both primary and secondary alcs. Lactones containing five-, six-, and seven-membered rings were successfully synthesized, and no over-oxidations to carboxylic acids were detected. The lactonization of unsym. diols containing two primary alcs. occurred with catalyst 1, but selectivity was low based on alc. electronics and modest based on alc. sterics. Evidence for a transfer dehydrogenation mechanism was found, and insight into the origin of selectivity in the lactonization of 1°/2° diols was obtained. Addnl., spectroscopic evidence for a trimethylamine-ligated iron species formed in solution during the reaction was discovered. The experimental process involved the reaction of Pentane-1,5-diol(cas: 111-29-5).Electric Literature of 111-29-5
The Article related to lactone preparation, diol transfer dehydrogenation iron catalyst, Heterocyclic Compounds (One Hetero Atom): Furans and other aspects.Electric Literature of 111-29-5
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