نتایج جستجو برای: benzoin
تعداد نتایج: 326 فیلتر نتایج به سال:
BACKGROUND The oxidative transformation of benzoin to benzil has been accomplished by the use of a wide variety of reagents or catalysts and different reaction procedures. The conventional oxidizing agents yielded mainly benzaldehyde or/and benzoic acid and only a trace amount of benzil. The limits of practical utilization of these reagents involves the use of stoichiometric amounts of corrosiv...
Styrax benzoin trees, native to the island Sumatra, Indonesia are wounded to produce resin that is collected and burned as incense. These wounds on trees commonly develop into expanding cankers that lead to tree death. The aim of this study was to consider whether Ophiostomatoid fungi, typically associated with wounds on trees might be associated with resin harvesting on S. benzoin. Samples wer...
The author presents a survey of his experience with the use of benzoin as an aid to prevent and to treat wound complications as: CSF leakage ruptured meningoceles, prevention of leakage and wound infections, during the use of external cranial drainage, indwelling catheters or implanted cannulas and electrodes. A few other handy uses are also mentioned.
A density functional theory study was performed to understand the detailed mechanisms of the cross-benzoin reactions catalyzed by N-heterocyclic carbene (NHC) species. Our theoretical study predicted that the first H-transfer operates with water in solution as a mediator, and the second H-transfer undergoes a concerted mechanism rather than a stepwise one. In addition, the chemoselectivity of t...
An initial rate evaluation of the triazolium-catalysed benzoin condensation permitted a Hammett structure–activity analysis providing insight into rate-limiting step.
BACKGROUND Contact dermatitis, as a cutaneous complication after rhinoplasty, is of early onset, limited and transient. The cause of this dermatitis is irritant or allergic. Late onset skin complications are rare and non-inflammatory. CASE PRESENTATION We are reporting an unexpected, severe allergic contact dermatitis of the face, in a young female, appearing one month following aesthetic rhi...
When a mixture of a few benzoins and a pyridine N-oxide SbC15 (1 : 1) complex (Complex A) was boiled in nitromethane, the corresponding benzils were obtained in various yields dependent upon the kinds of substituents in each reactant. The yield of benzil becames higher by adding some tertiary amines. In this reaction, tribenzylamine is a good accelerator to promote it. When Complex A, 4-picolin...
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