- Aerobic oxidation of benzylic halides to carbonyl compounds with molecular oxygen catalyzed by tempo/kno2 in aqueous media
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Benzylic halides were successfully oxidized to the corresponding aldehydes and ketones in good to excellent yields in aqueous media with molecular oxygen as oxidant in the presence of catalytic amounts of TEMPO (2,2,6,6- tetramethylpiperidyl-1-oxy) and potassium nitrite (KNO2).
- Liu, Qifa,Lu, Ming,Yang, Fei,Wei, Wei,Sun, Feng,Yang, Zhenbang,Huang, Sufeng
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scheme or table
p. 1106 - 1114
(2010/04/29)
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- Rare earth metal trifluoromethanesulfonates catalyzed benzyl-etherification.
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Rare earth metal trifluoromethanesulfonates [rare earth metal triflate, RE(OTf)3] were found to be efficient catalyst for benzyl-etherification. In the presence of a catalytic amount of RE(OTf)3, condensation of benzyl alcohols and aliphatic alcohols proceeded smoothly to afford the benzyl ethers. The condensation between benzyl alcohols and thiols also proceeded, and thio ethers were obtained in good yield. In these reactions, RE(OTf)3 could be recovered easily after the reactions were completed and could be reused without loss of activity.
- Kawada, Atsushi,Yasuda, Kayo,Abe, Hitoshi,Harayama, Takashi
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p. 380 - 383
(2007/10/03)
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- One- and Two-Dimensional NMR Study of Resol Phenol-Formaldehyde Prepolymer Resins
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A one- and two-dimensional NMR study was performed on three commercial resol phenol-formaldehyde (PF) prepolymer resins. 1H, 13C, CSCM and DQF COSY NMR spectral data, in acetone-d6, were obtained on each resin and on PF model compounds: phenol, five methylolphenols, four diphenylmethanes, two formals, two dibenzyl ethers and two dibenzylamines.Gated-decoupled 13C experiments, using 2,4,6-trimethylphenol as internal standard, were used to quantitate the major components present in each of the three resins.The major chemical differences of the three resins were noted.A DQF COSY method was developed that allowed the qualitative identification of most of the major phenolic components present in each of the PF resins. - Keywords: NMR; 1H NMR; 13C NMR; Phenol-formaldehyde resins
- Fisher, Thomas H.,Chao, Ping,Upton, G. Cindy,Day, Anthony J.
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p. 717 - 723
(2007/10/02)
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