A Synergic Blend of Newly Isolated Pseudomonas mandelii KJLPB5 and [hmim]Br for Chemoselective 2° Aryl Alcohol Oxidation in H2O2: Synthesis of Aryl Ketone or Aldehydes via Sequential Dehydration-Oxidative C=C Cleavage
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Abstract
Pseudomonas mandelii KJLPB5 is reported for the oxidation of aryl alcohols in ionic liquid [hmim]Br (1-hexyl-3-methyl imidazolium bromide) with H2O2. With a slight alteration of reaction conditions, the developed protocol leads either to (i) chemoselective oxidation of 2° aryl alcohols over 1° and aliphatic counterparts or (ii) direct one pot-two step sequential conversion of 2° aryl alcohols into corresponding one or two carbons shorter aryl aldehydes through oxidative cleavage pathway, thus providing a new facet to metal-free oxidations. The key operational parameters such as substrate concentration, incubation temperature, incubation time, ionic liquid type and ionic liquid concentration are also optimized.
Graphical Abstract
Keywords
Biocatalysis Pseudomonas mandelii Ionic liquid Alkene cleavage OxidationNotes
Acknowledgments
NS and UKS are indebted to CSIR New Delhi for the award of research fellowships. CSIR Delhi is acknowledged for financial support (NWP0006, MLP0025 and MLP0034). The authors are grateful to the Director, IHBT Palampur, for his kind cooperation and encouragement.
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References
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