Vanadium-catalyzed atmosphericoxidation of benzyl alcoholsusing water as Solvent

Chemistry Letters

Volumn 40, Issue 5, 2011, Pages 495-497

  Kodama, Shintaro ^a   Hashidate, Suguru ^a   Nomoto, Akihiro ^a   Yano, Shigenobu ^b   Ueshima, Michio ^a   Ogawa, Akiya ^a  

^a Osaka Prefecture University   (Japan)

^b NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 79958232402     PISSN: 03667022     EISSN: 13480715     Source Type: Journal    
DOI: 10.1246/cl.2011.495     Document Type: Article

References (37)

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33. 7b, 7c
34. 2+ ion is desirable in our reaction system.
35. 4 is vanadium(IV) species, and vanadium(V) species may be formed by oxidation of vanadium(IV) species with molecular oxygen. There isa possibility that the vanadium(V) species acts as active species in the oxidation reaction.
36. 1HNMR spectra. As a result, the yieldof acetophenone (2f) continued to increase after consuming 1a completely. Also, benzophe- none (2a) was generated from the oxidation of 1a. Hence, we examined the oxidation of 1 f using 2a as an additive, but the reaction scarcely proceeded. In addition, the substituents on aromaticrings of benzhydrols as additives may affect the activity of vanadium catalysts, because the oxidation of 1h using 1a as an additive instead of ρ-nitrobenzhydrol (1e), under the conditions of Table 2, Entry 9, proceeded slowly to afford 2h (22 h, 51%). From these results, we believe that benzhydrols may act as ligands for the vanadium complexes to improve catalytic activity in our reaction system.
37. Supporting Information is availableelectronically on the CSJ-Journal Web site, http://www.csj.jp/journals/chem-lett/index.html.