Academic Journal
Effect of substituents on partial photocatalytic oxidation of aromatic alcohols assisted by polymeric C3N4
| العنوان: | Effect of substituents on partial photocatalytic oxidation of aromatic alcohols assisted by polymeric C3N4 |
|---|---|
| المؤلفون: | Krivtsov, I. V., Ilkaeva, Marina, García-López, Elisa I., Marcì, Giuseppe, Palmisano, Leonardo, Bartashevich, Ekaterina V., Matveeva, Olga G., Díaz, Eva, Ordóñez, Salvador |
| المساهمون: | Ministerio de Economía y Competitividad (España), Principado de Asturias, Ministry of Science and Higher Education of the Russian Federation, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España) |
| بيانات النشر: | Wiley-VCH |
| سنة النشر: | 2019 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| الوصف: | In the present work we scrutinize the effect of substituents in the phenyl ring of the benzyl alcohol on its photo-oxidation to the corresponding benzaldehyde driven by polymeric carbon nitride photocatalyst in aqueous medium. It has been established that electron donating (ED) substituents in para- and ortho-position with respect to the CH2OH-group promote the reactivity of the substrate without compromising the selectivity towards benzaldehyde formation, maintaining it in the range of 84–98 %, if compared to the unsubstituted molecule. The same observation is true for meta-substituted benzyl alcohol with an electron withdrawing (EW) group. On the other hand, the presence of ED-group in meta-position or EW-group in para-position with respect to the CH2OH-group reduces the reactivity as well as the selectivity towards the aldehyde production, resulting in the values of selectivity ranging from 40 to 80 %. Quantum chemical calculations have allowed to establish that the reactivity correlates with the positive charge on the benzylic carbon in benzyl alcohol cation intermediate, while the selectivity, most probably, is conditioned by a negative charge on the carbon atoms in the phenyl ring being a target for an electrophile attack. The modification of the polymeric C3N4 photocatalyst with H2O2 reduces the unselective benzyl alcohol oxidation, thus favouring the higher selectivity towards benzaldehyde production. ; This work is supported by Spanish MINECO ( MAT2016-78155-C2-1-R; CTQ2017-89443-C3-2-R) and Gobierno del Principado de Asturias (GRUPIN-ID2018-170; GRUPIN-ID2018-116). Theoretical modelling supported by the grants of Ministry of Education and Science of the Russian Federation No 4.1157.2017/4.6. IK acknowledges financial support from Ministry of Education and Science of the Russian Federation (grant No 4.9722.2017/8.9). ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1867-3899 |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/MINECO//MAT2016-78155-C2-1-R; info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTQ2017-89443-C3-2-R/ES/O: DESARROLLO DE CATALIZADORES Y PROCESOS PARA LA OBTENCION DE COMPUESTOS ORGANO-OXIGENADOS Y AROMATICOS DE INTERES INDUSTRIAL A PARTIR DE BIOMOLECULAS PLATAFORMA/; Postprint; The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1002/cctc.201900362; https://doi.org/10.1002/cctc.201900362; Sí; ChemCatChem 11(11): 2713-2724 (2019); http://hdl.handle.net/10261/359580 |
| DOI: | 10.1002/cctc.201900362 |
| الاتاحة: | http://hdl.handle.net/10261/359580 https://doi.org/10.1002/cctc.201900362 |
| Rights: | open |
| رقم الانضمام: | edsbas.2E164669 |
| قاعدة البيانات: | BASE |
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