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Catalysts 2019, 9(4), 304; https://doi.org/10.3390/catal9040304

New Functionalized Polycycles Obtained by Photocatalytic Oxygenation Using Mn(III) Porphyrins in Basic Media

1
Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
2
Department of General and Inorganic Chemistry, Institute of Chemistry, Faculty of Engineering, University of Pannonia, P.O.B. 158, H-8201 Veszprém, Hungary
*
Authors to whom correspondence should be addressed.
Received: 28 February 2019 / Revised: 20 March 2019 / Accepted: 22 March 2019 / Published: 27 March 2019
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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Abstract

According to our earlier observations, the products of photocatalytic oxygenations of furan and thiophene derivatives of benzobicyclo[3.2.1]octadiene with anionic and cationic manganese(III) porphyrin at pH = 7 strongly depended on the type and position of the heteroatom in the aromatic ring, as well as the charge of the photocatalyst. Hence, a significant pH increase (to 10) in these systems offered a reasonable tool to affect the diversity and yields of the oxygenation products. They were quantitatively separated by TLC and identified with NMR analyses. The results clearly indicated that the increase of HO concentration, in most cases, considerably changed the product yield, e.g., enhanced it to 70% for the hydroxy-furyl derivative. Accordingly, the selectivity of the oxygenation of the furan compound could be improved in this way. In the case of one thienyl compound, however, even an additional product appeared, while the yields of the products of the other thiophene derivative (with cationic catalyst) decreased to zero, suggesting the application of lower pH for preparative purposes. The pH effects indicate that oxygenation reactions in these systems involve more photochemically generated oxidative agents, e.g., OH and (P)Mn(V)=O), the role of which is affected by the pH increase in various ways. View Full-Text
Keywords: benzobicyclo[3.2.1]octadienes; furan; Mn(III)porphyrins; pH influence; photocatalytic oxygenation; thiophene benzobicyclo[3.2.1]octadienes; furan; Mn(III)porphyrins; pH influence; photocatalytic oxygenation; thiophene
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Vuk, D.; Horváth, O.; Škorić, I. New Functionalized Polycycles Obtained by Photocatalytic Oxygenation Using Mn(III) Porphyrins in Basic Media. Catalysts 2019, 9, 304.

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