DR ANTHONY MELVIN CRASTO Ph.D

REVIEW–AMIIDE BOND

http://www.nature.com/nature/journal/v480/n7378/full/nature10702.html#/f3 One of the most important reactions in organic chemistry—amide bond formation—is often overlooked as a contemporary challenge because of the widespread occurrence of amides in modern pharmaceuticals and biologically active compounds. But existing methods are reaching their inherent limits, and concerns about their waste and expense are becoming sharper. Novel chemical approaches to amide… Continue reading REVIEW–AMIIDE BOND

Visible-light-mediated conversion of alcohols to halides

http://www.nature.com/nchem/journal/v3/n2/full/nchem.949.html Nature chemistry, v3, pg140-145, 2011 DOI:doi:10.1038/nchem.949 The development of new means of activating molecules and bonds for chemical reactions is a fundamental objective for chemists. In this regard, visible-light photoredox catalysis has emerged as a powerful technique for chemoselective activation of chemical bonds under mild reaction conditions. Here, we report a visible-light-mediated photocatalytic alcohol… Continue reading Visible-light-mediated conversion of alcohols to halides

2D-NMR (HMQC, HMBC, 1H-1H COSY and NOESY), for rel- (1R,2S,3R,4R) p-menthane-1,2,3-triol 3-O-β-D-glucopyranoside (1)

http://journal.chemistrycentral.com/content/6/1/37 New monocyclic monoterpenoid glycoside from Mentha haplocalyx Briq. Gai-Mei Sheet al Chemistry Central Journal 2012, 6:37 doi:10.1186/1752-153X-6-37 new monocyclic monoterpenoid glycosides, rel-(1R,2S,3R,4R) p-menthane-1,2,3-triol 3-O-β-D-glucopyranoside (1) were isolated from aqueous acetone extract of the aerial parts of Mentha haplocalyx Briq.. On the basis of spectroscopic methods, including 2D-NMR (HMQC, HMBC, 1H-1H COSY and NOESY), the… Continue reading 2D-NMR (HMQC, HMBC, 1H-1H COSY and NOESY), for rel- (1R,2S,3R,4R) p-menthane-1,2,3-triol 3-O-β-D-glucopyranoside (1)

New bactericide derived from Isatin for treating oilfield reinjection water

http://journal.chemistrycentral.com/content/6/1/90/abstract Isatin, an extract from Strobilanthes cusia (Nees) Kuntze, was the base for synthesizing derivatives that were screened for antibacterial activity against oilfield water-borne bacteria. The bacterial groups are sulfate reducing, iron and total. The derivatives were characterized by spectrums and they showed good to moderate activity against sulfate reducing bacteria. New bactericide derived from… Continue reading New bactericide derived from Isatin for treating oilfield reinjection water

Mesoporous AlPO4: A Highly Efficient Heterogeneous Catalyst for Synthesis of 5-Substituted 1H-Tetrazoles from Nitriles and Sodium Azide

Mesoporous AlPO4: A Highly Efficient Heterogeneous Catalyst for Synthesis of 5-Substituted 1H-Tetrazoles from Nitriles and Sodium Azide via [3 + 2] Cycloaddition https://www.jstage.jst.go.jp/article/cl/41/8/41_CL-120272/_pdf Share this:

Design Concept for High-LUMO-level Fullerene Electron-acceptors for Organic Solar Cells

Chemistry Letters Vol. 41, No. 8 (August, 2012) Design Concept for High-LUMO-level Fullerene Electron-acceptors for Organic Solar Cells by Yutaka Matsuo on pg 754 Department of Chemistry, School of Science, The University of Tokyo This review article describes design concept, synthesis, and features of fullerene derivatives having high lowest unoccupied molecular orbital (LUMO) levels to… Continue reading Design Concept for High-LUMO-level Fullerene Electron-acceptors for Organic Solar Cells

SUGAR MANUFACTURING

The initial stage involves sampling, weighing and washing the sugarcane. From there the material passes to can crushers and then into the mill. The bagasse, which results from the milling, is used in the boilers for steam production that is used to power the process. The surplus bagasse from this stage is used in industry.… Continue reading SUGAR MANUFACTURING

Development of Heterogeneous Catalysts for the Conversion of Levulinic Acid to γ-Valerolactone

http://onlinelibrary.wiley.com/doi/10.1002/cssc.201200111/abstract Biomass-derived γ-valerolactone (GVL) can be used for manufacturing food, chemicals, and fuels. Numerous hydrogenation catalysts have been developed for the GVL synthesis, with heterogeneous systems arguably the most viable. We discuss current heterogeneous systems, with emphasis on catalyst innovation and development of integrated biomass processing. William R. H. Wright, Regina Palkovits Development of Heterogeneous… Continue reading Development of Heterogeneous Catalysts for the Conversion of Levulinic Acid to γ-Valerolactone

Chiloglottone –Australian orchid uses a single simple diketone to attract wasps that pollinate it

The Australian orchid Chiloglottis trapeziformis' very existence hinges upon there being some truth to the old adage that love is blind. Unlike other flowers, which lure pollinators with nectar, C. trapeziformis attracts its pollinator, the thynnine wasp Neozeleboria cryptoides, by producing the same pheromone that the insects use to attract the opposite sex–a practice… Continue reading Chiloglottone –Australian orchid uses a single simple diketone to attract wasps that pollinate it

2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis

http://onlinelibrary.wiley.com/doi/10.1002/ejoc.201200838/abstract Asymmetric Ion-Pairing Catalysis of the Reversible Cyclization of 2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis of an Equilibrating Reaction Lukas Hintermann and Claudia Dittmer The cyclization of nonactivated 2′-hydroxychalcones to flavanones has been realized for the first time with asymmetric induction. In spite of the reversibility of the reactions, this ion-pairing catalysis reaches intrinsic enantioselectivities… Continue reading 2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis