Crystal structure of 4-(dimethylamino)-pyridinium 4-aminobenzoate dihydrate

Acknowledgements The authors thank SAIF, IIT, Madras for thedata collection.Peer reviewedPublisher PD

A new record of a rare species Masturus lanceolatus (Point-tail sunfish) from Chennai coastal waters, India

297-301A single individual point tailed sunfish Masturus lanceolatus was landed at Kasimedu fishing harbour, Chennai coast by gill netter, for the first time. In the present study, morphometrics and meristic measurements of the sunfish were made, which was found to be 120 cm long and weighed approximately 44 kg. The specimen has been compared with earlier reports

3-(2-Meth­oxy­naphthalen-1-yl)-2-benzofuran-1(3H)-one

The asymmetric unit of the title compound, C19H14O3, contains two crystallographically independent mol­ecules in which the dihedral angles between the naphthalene and benzofuran ring systems are 76.49 (7) and 86.17 (7)°. In the crystal, mol­ecules are linked by inter­molecular C—H⋯O hydrogen-bonding inter­actions into chains running parallel to the a axis. In addition, the crystal packing is stabilized by C—H⋯π inter­actions

AN EFFICIENT, GREEN, CATALYST FREE SYNTHESIS AND CRYSTALLOGRAPHIC STUDY OF BENZO-4H-PYRANS IN AQUEOUS MEDIUM

A highly efficient and environmentally benign for the synthesis a of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives (4a-n) in good to high yields (90%-97%) by one-pot three-component Michael addition reaction of malononitrile, aromatic aldehydes and resorcinol under reflux condition was developed in aqueous medium. Single crystal X-ray studies show that 4h crystallizes in the formula C22H15Cl2N2O2, Mr=410.26, Monoclinic, Space group P2(1)/c, a=12.753(9)Å, b=6.665(4)Å, c=24.050(14) Å, β=102.95(3)A° and 4i C16H10Cl2N2O2, Mr=333.16, Triclinic, Space group P-1, a=6.271(3)Å, b=18.697(5)Å, c =13.794(7) Å,  β =94.269(17)A°. The structure of the products were further confirmed by 1H NMR, 13C NMR, IR and Mass spectrum. Keywords: Benzopyrans, malononitrile, resorcinol, Michael addition, water mediated synthesis, single crystal XR

A BENIGN SYNTHESIS OF 2-AMINO-3-CYANO-4H-BENZOPYRANS VIA DOMINO REACTION

A green and operationally simple approach domino reaction has been developed for the synthesis of 2-amino-3-cyano- 4H-chromene derivatives from aromatic aldehydes, resorcinol and malononitrile in aqueous medium. This work represents the first example of catalyst free and organic solvents free multi-component reactions for the synthesis of pharmaceutically important chromene derivatives. The structures of the synthesized compounds were confirmed by 1H NMR, 13C NMR, IR, Mass and single crystal XRD.  Keywords: Benzopyrans, malononitrile, Michael addition reaction, domino reaction, water mediated synthesis

Arribazón de medusa azul Porpita porpita en las playas de Visakhapatnam, India (Bahía occidental de Bengala)

Porpita porpita occurs in the tropical and sub-tropical waters of the Pacific, Atlantic, and Indian Oceans, and the mass numbers of stranded colonies seem to be increasing. Although its presence in Indian waters is minimal, this is the first record ever made of P. porpita in Visakhapatnam coastal waters. The present study provided a detailed description of the species and its global distribution. Further, the perceived increase in gelatinous zooplankton blooms in the observed area indicates that jellyfish can negatively affect fisheries because they compete with zooplanktivorous fish, prey upon fish eggs and larvae, and indirectly compete with higher trophic levels by reducing the plankton available to planktivores. Conversely, jellyfishes also play a vital role in regulating global marine plankton food webs, spatio-temporal dynamics, and biomass, which is a role that has been generally neglected so far.Porpita porpita se encuentra en las aguas tropicales y subtropicales de los océanos Pacífico, Atlántico e Índico, y el número masivo de colonias varadas parece estar aumentando. Aunque su presencia en las aguas de la India es mínima, este es el primer registro de P. porpita en las aguas costeras de Visakhapatnam. El presente estudio proporcionó una descripción detallada de la especie y su distribución global. Además, el aumento percibido en las floraciones de zooplancton gelatinoso en el área observada, indica que las medusas pueden afectar negativamente a las pesquerías porque compiten con los peces zooplanctívoros, se alimentan de huevos y larvas de peces, e indirectamente compiten con niveles tróficos más altos al reducir el plancton disponible para los planctívoros. Por el contrario, las medusas también juegan un papel vital en la regulación de las redes alimentarias del plancton marino global, la dinámica espacio-temporal y la biomasa, un papel que generalmente se ha descuidado hasta ahora.  

Further records of rare brachyuran crab Eucrate indica (Crustacea: Decapoda: Brachyura Euryplacidae) along the Chennai coast, Tamil Nadu, India

This study reports further occurrence of the crab Eucrate indica (Crustacea: Decapoda: Brachyura: Euryplacidae) along the Chennai coast, Tamil Nadu, India. The crabs were obtained from a depth of 40-60 m in the trawl by-catch. The morphological features, color and distribution of these crabs are given

(Biphenyl-4-yl)[2-(4-methyl­benzo­yl)phen­yl]methanone

In the title compound, C27H20O2, the central benzene ring makes dihedral angles of 64.86 (7) and 70.35 (7)° with the methyl-substituted ring and the biphenyl ring system, respectively. The crystal packing is stabilized by inter­molecular C—H⋯O inter­actions, which link the mol­ecules into chains parallel to the b axis

(4-Methyl­phen­yl)[2-(thio­phen-2-ylcarbon­yl)phen­yl]methanone

The crystal studied of the title compound, C19H14O2S, was an inversion twin with a 0.7 (1):0.3 (1) domain ratio. The central benzene ring makes dihedral angles of 63.31 (9) and 60.86 (9)°, respectively, with the 4-methyl­phenyl and thio­phene rings. In the crystal, mol­ecules are linked by weak inter­molecular C—H⋯O hydrogen bonds and S⋯π [3.609 (3) Å] inter­actions