Tetrahydrobenzo[b]pyran
![Investigation of Eletrooxidation Reaction of Some Tetrahydrobenzo[b]pyran Derivatives](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==)
Investigation of Eletrooxidation Reaction of Some Tetrahydrobenzo[b]pyran Derivatives
... The oxidation mechanism of a series of tetrahydrobenzo[b]pyran (THP) derivatives (1-6) has been investigated at glassy carbon electrode. The study is performed in dimethylformamide (DMF) by cyclic ...
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Kinetic Aspects of Tetrahydrobenzo[B]Pyran Formation in The Presence of Agar as A Green Catalyst: A Mechanistic Investigation
... In this article, we describe kinetic investigation of the reaction was done using UV spectrophotometry and the results are declared in the following terms. The overall order of reaction for the formation of a ...
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Synthesis and Characterization of a Novel Nanosilica Supported Bipyridinium Chloride Nanocomposite and its Application as a Basic Catalyst in the One-pot Preparation of Tetrahydrobenzo[b]pyran, Dihydropyrano[3,2-c]chromene and Dihydropyrano[4,3-b]pyran Derivatives
... A novel rice-husk-silica supported n-propyl bipyridinium chloride (RHPrBPCl) has been prepared. Due to the basicity of RHPrBPCl, it was decided to evaluate its catalytic activity in the one-pot preparation of ...
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A Novel Catalyst for One pot Synthesis of Tetrahydrobenzo[b]pyran derivatives
... Aromatic aldehydes with substituents carrying either electrondonating or electron-withdrawing groups reacted successfully and gave the products in high yields. To demonstrate the scope of the procedure, the reaction of ...
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Insights into the Reaction Mechanism of the Tetrahydrobenzo[b]pyran by means of Kinetic Studies in the Presence of Fructose as a Green Catalyst
... of tetrahydrobenzo[b]pyran in the presence of fructose showed second-order kinetics and the partial orders with respect to 4-methoxybenzaldehyde 1, malononitrile 2 and dimedone 3 were one, one and ...
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A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation
... new tetrahydrobenzo[b]pyran derivatives were synthesized via a three component reaction of different aro- matic aldehydes, methyl cyanoacetate and 1,3-cyclohexadione, with water as solvent under ...
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One Pot Multicomponent Synthesis of Tetrahydrobenzo[ b pyrans and Dihydropyrano[ c] chromenes using Magnetically Separable NiFe
... of tetrahydrobenzo[b]pyran and dihydropyrano[c]chromenes derivatives, as they can show better activity due to their large surface area and can easily be separated from the reaction due to their ...
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Kinetics and Mechanism Investigation on Green and Three –Component One Spot Synthesis of 4H-Tetrahydrobenzo[B]Pyrans using Caffeine as A Facile and Green Catalyst
... In this article, UV-vis spectroscopy has been used in order to study the reaction kinetics between benzaldehyde 1, malononitrile 2 and dimedone 3 in a mixture of (ethanol / water, 1:2) as solvents in the presence of ...
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7 Chloromethylbenzo[b]naphtho[1,2 d]pyran 6 one
... Data collection: SMART Siemens, 1996; cell re®nement: SAINT Siemens, 1996; data reduction: SAINT; programs used to solve structure: SHELXTL Sheldrick, 1997; programs used to re®ne struct[r] ...
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Ethyl 2 amino 4 (3 nitrophenyl) 4H 1 benzothieno[3,2 b]pyran 3 carboxylate
... In a 100 ml flask equipped with a condenser was dissolved 4 mmol of (Z)-2-(3-nitrobenzylidene)-1-benzo[b]thio- phen-3(2H)-one and 5 mmol of ethyl cyanoacetate in 30 ml of ethanol. Then, 1 ml of piperidine was ...
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Crystal structure of 3 benzoyl 2 [(5 bromo 2 Hydroxy 3 methoxybenzylidene)amino] 4,5,6,7 tetrahydrobenzo[b]thiophene
... 1-benzothiophene-3-yl](phenyl)methanone (II) [SODGUP; Kaur et al., 2014b], [2-(benzylideneamino)-4,5,6,7-tetra- hydrobenzo[b]thiophen-3yl](phenyl)methanone (III) [YIYDAN; Kaur et al., 2014c], ...
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2 Benzyl 1 hydroxy 5,6 dihydro 3H naphtho[2,1 b]pyran 3 one
... Data collection: SDP Frenz, 1985; cell re®nement: SDP; data reduction: WinGX Farrugia, 1999; programs used to solve structure: SHELXS97 Sheldrick, 1997; programs used to re®ne structure:[r] ...
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Synthesis and reactions of some 4h Pyrans using new Natural Catalyst
... naphthyridine structure 5a can be suggested for the reaction product. By the same way 5,6-dihydro-1,6-naphthyridine 5b was formed via reaction of the 2-amino-4H-pyran 1f with malononitrile. On the other hand, 5, ...
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Nano-Silica Phosphoric Acid: An Efficient Catalyst for One-Pot Synthesis of Tetrahydrobenzo[a]xanthenes-11-one Under Solvent- Free or Sonication Conditions
... Then, the catalyst residue was washed with acetone and reused. Treatment with acetone removes the tar from the catalyst surface more efficiently (table 1, entries 12 and 13). The catalyst was reusable although a gradual ...
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Crystal structure of 3 (4 methoxyphenyl) 2,3 dihydro 1H naphtho[2,1 b]pyran 1 one
... Data collection: APEX2 Bruker, 2004; cell refinement: SAINT Bruker, 2004; data reduction: SAINT; programs used to solve structure: SHELXS97 Sheldrick, 2008; programs used to refine struc[r] ...
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SYNTHETIC APPROACHES FOR PYRAN CONTAINING BIOACTIVE NATURAL PRODUCTS: SPIRASTRELLOLIDE B, PASSIFLORICINS, ACULEATINS AND 6-EPIPRELACTONE-V
... substituted pyran scaffold in chiral form, a total synthesis of the non-natural enantiomer of prelactone, (-)-6-epiprelactone-V (1) was achieved employing a highly chemo-regio- and stereoselective tandem ester ...
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Crystal structure of 2 amino 3 cyano 4 (4 methoxyphenyl) 4H 1 benzothieno[3,2 b]pyran
... For biological properties of 2-amino-4-aryl-4H-pyran deriva- tives, see: Panda et al. (1997); Mungra et al. (2011). For the reactivity of (Z)-2-arylidenebenzo[b]thiophen-3(2H)-ones (thioaurones), see: ...
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Crystal structure of ethyl 2 amino 4 (4 chlorophenyl) 4H 1 benzothieno[3,2 b]pyran 3 carboxylate
... The molecule of the title compound, Fig. 1, is formed by three fused rings linked to an ethyl-3-carboxylate group and to a 4-chlorophenyl. The three fused rings (S1/C1—C11/O1) are nearly coplanar, with the maximum ...
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A CONVENIENT ONE POT SYNTHESIS OF TETRAHYDROBENZO [C] XANTHENE 1,11 DIONE DERIVATIVES IN AQUEOUS MEDIUM
... synthesis tetrahydrobenzo[C]xanthene- 1,11-diones, a model reaction was performed using reaction of 4-chloro benzaldehyde, 4- hydroxylcoumarin and 5,5-dimethylcyclohexane-1,3-dione with different ratios of ...
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A photodimer of a 4 phenyl 4H pyran
... For the solid-state dimerization reaction of diethyl 2,6-dimethyl-4- phenyl-4H-pyran-3,5-dicarboxylate, (1), the compound (0.5 g) was dissolved in dichloromethane (5 ml) and poured into the photolysis unit. The ...
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