The Advances and Applications of Arynes and Their Precursors to Synthesize the Heterocyclic Compounds: A Review
Md. Ashraful Alam,
Kazuaki Shimada,
Aklima Jahan,
Dina Nasrin,
Md. Kudrat-E-Zahan,
Mohammad Shahabuddin
Issue:
Volume 3, Issue 5, October 2017
Pages:
47-54
Received:
6 September 2017
Accepted:
21 September 2017
Published:
23 October 2017
Abstract: The aryne and its intermediates or their precursors are the most important compounds in organic synthesis for the purpose of arynes or benzyne insertion in many reactions. Arynes are among the first reactive intermediates known to organic chemists. Since their discovery, they have fascinated chemists from both theoretical and synthetic perspectives. These remarkable intermediates possess a wide reactivity profile, engaging in the different types of reactions especially in organic chemistry fields like nucleophilic addition reactions, pericyclic reactions, [4+2] and [3+2] cycloaddition reactions and transition metal-mediated/catalyzed reactions. This methodology would also be applicable for the synthesis of biologically and pharmaceutically active products such as isocoumarins, benzodiazepines and other important compounds in one pot reactions.
Abstract: The aryne and its intermediates or their precursors are the most important compounds in organic synthesis for the purpose of arynes or benzyne insertion in many reactions. Arynes are among the first reactive intermediates known to organic chemists. Since their discovery, they have fascinated chemists from both theoretical and synthetic perspectives...
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Chemical Analysis of Eucalyptus grandis Wood Manured with Biosolid on Two Valuation Methods
Ricardo Marques Barreiros,
Fábio Minoru Yamaji,
Tufic Madi Filho
Issue:
Volume 3, Issue 5, October 2017
Pages:
55-59
Received:
9 October 2017
Accepted:
18 October 2017
Published:
10 November 2017
Abstract: Neutron activation analysis followed by a gamma-ray spectroscopy and physico-chemical methods were used to conduct a thorough investigation of the elements transferred from sewage sludge (biosolid) into the wood of Eucalyptus grandis. Four different manure samples were analyzed: control without biosolid and samples with 10, 20 and 40 t ha-1 of biosolid. A significant increase of Ca was detected, but there was no change in K and a clear decline in Mn. The experiment showed that the application of biosolids is a good alternative as fertilizer, since it gives a destination to this residual product without compromising the wood with heavy metals, it can even make the cellulose pulp bleaching process less expensive, due to the decrease of the content of Mn.
Abstract: Neutron activation analysis followed by a gamma-ray spectroscopy and physico-chemical methods were used to conduct a thorough investigation of the elements transferred from sewage sludge (biosolid) into the wood of Eucalyptus grandis. Four different manure samples were analyzed: control without biosolid and samples with 10, 20 and 40 t ha-1 of bios...
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