65513-22-6Relevant articles and documents
Ni-NiO heterojunctions: a versatile nanocatalyst for regioselective halogenation and oxidative esterification of aromatics
Bhardwaj, Nivedita,Goel, Bharat,Indra, Arindam,Jain, Shreyans K.,Singh, Ajit Kumar,Tripathi, Nancy
, p. 14177 - 14183 (2021/08/16)
Herein, we report a facile method for the synthesis of Ni-NiO heterojunction nanoparticles, which we utilized for the nuclear halogenation reaction of phenol and substituted phenols usingN-bromosuccinimide (NBS). A remarkablepara-selectivity was achieved for the halogenated products under semi-aqueous conditions. Interestingly, blocking of thepara-position of phenol offeredortho-selective halogenation. In addition, the Ni-NiO nanoparticles catalyzed the oxidative esterification of carbonyl compounds with alcohol, diol or dithiol in the presence of a catalytic amount of NBS. It was observed that the aromatic carbonyls substituted with an electron-donating group favoured nuclear halogenation, whereas an electron-withdrawing group substitution in carbonyl compounds facilitated the oxidation reaction. In addition, the catalyst was magnetically separated and recycled 10 times. The tuned electronic structure at the Ni-NiO heterojunction controlled selectivity and activity as no suchpara-selectivity was observed with commercially available NiO or Ni nanoparticles.
Highly efficient and chemoselective acetalization and thioacetalization of aldehydes catalyzed by propylphosphonic anhydride (T3P) at room temperature
Augustine, John Kallikat,Bombrun, Agnes,Sauer, Wolfgang H.B.,Vijaykumar, Pujari
, p. 5030 - 5033 (2012/11/07)
Propylphosphonic anhydride (T3P), a low toxic peptide coupling agent, has been demonstrated to be an efficient catalyst for the chemoselective acetalization and thioacetalization of aldehydes in the presence of ketones. Cyclic and acyclic acetals of diverse aldehydes were obtained in good to excellent yields at room temperature in the presence of a catalytic amount of T3P.
ELECTRONIC EFFECT OF 1,3-DIOXACYCLANE SUBSTITUENTS IN NITROBENZALDEHYDE ACETALS
Ovchinnikov, V. V.,Evstaf'eva, Yu. G.,Latypova, V. Z.,Bogoveeva, G. A.,Cherkasov, R. A.
, p. 196 - 199 (2007/10/02)
The electronic effect of 1,3-dioxacyclane substituents in p- and m-nitrobenzaldehyde acetals was studied by IR spectroscopy and electrochemical reduction.In the investigated compounds the electron-withdrawing effect of the 1,3-dioxolane fragments is more
