3-Formylchromones as diverse building blocks in heterocycles synthesis

This review covers the chemical reactivity of 3-formylchromones towards condensation reactions with a variety of carbon and nitrogen nucleophiles. Some chromone derivatives linked a variety of heterocyclic systems were prepared from the direct condensation of 3-formylchromones with heterocyclic compounds containing active methylene groups. A diverse number of fused heterocyclic systems were prepared from the reaction of 3-formylchromones with some bifunctional nucleophiles, these reactions mainly proceed via condensation with the aldehydic function followed by nucleophilic attack at C-2 position of the chromone moiety

ADVANCES IN AUTOMOBILE SUSPENSION SYSTEM

This study reviews the initial development of suspension system, necessity of suspension system for an automobile sector, concept of vibration, its causes, reasons and effects of vibrations on the automobile system. This review also includes important information on advanced suspension systems for automobiles, conventional and non-conventional suspension systems, a brief information about conventional suspension systems containing springs, shock absorbers, and dampers. A brief introduction of some of the recent suspension systems used in the automobiles today is also elaborated like Bose suspension system which includes the use of the linear electromagnetic motor, double wishbone suspension system, Ferro-fluid or magneto-rheological dampers and Ford’s control blade suspension system. These suspension systems are now-a-days being included in to various automobiles to reduce the overall body motion and jarring vibrations and enhance comfort and control

Advances In Automobile Suspension System

This study reviews the initial development of suspension system, necessity of suspension system for an automobile sector, concept of vibration, its causes, reasons and effects of vibrations on the automobile system. This review also includes important information on advanced suspension systems for automobiles, conventional and non-conventional suspension systems, a brief information about conventional suspension systems containing springs, shock absorbers, and dampers. A brief introduction of some of the recent suspension systems used in the automobiles today is also elaborated like Bose suspension system which includes the use of the linear electromagnetic motor, double wishbone suspension system, Ferro-fluid or magneto-rheological dampers and Ford's control blade suspension system. These suspension systems are now-a-days being included in to various automobiles to reduce the overall body motion and jarring vibrations and enhance comfort and control

Conventional and ultrasound mediated synthesis of some thiadiazoles, triazoles and oxadiazoles

2776-2780Acid hydrazide 1 when treated with aryl isothiocyanates gives the compounds 2. These compounds 2 on ultrasound irradiation in acidic medium give compounds 3 i.e. thiadiazoles and in basic medium gives compounds 4 i.e. triazoles. These compounds 2 on treatment with I2/KI and NaOH resulted in compounds 5 i.e. oxadiazoles. These compounds are synthesized by conventional method as well as ultra sound irradiation method

Conventional and Ultrasound Mediated Synthesis of Some Thiadiazoles, Triazoles and Oxadiazoles.

2776-2780Acid hydrazide 1 when treated with aryl isothiocyanates gives the compounds 2. These compounds 2 on ultrasound irradiation in acidic medium give compounds 3 i.e. thiadiazoles and in basic medium gives compounds 4 i.e. triazoles. These compounds 2 on treatment with I2/KI and NaOH resulted in compounds 5 i.e. oxadiazoles. These compounds are synthesized by conventional method as well as ultra sound irradiation method

Condensation reactions of various nucleophiles with 3-formylchromone

288-2913-Formylchromones 1 are condensed with 1-(2,4-difluorophenyl-2-[1,2,4]triazol-4-yl)ethanone in acetic anhydride to afford 3-[3-(2,4-difluoro-phenyl)-3-oxo-2-[1,2,4]triazol-4-yl)propenyl]chromon-4-ones 2. 3-Formylchromone 1 when heated with benzo[d]isoxazol-3-yl-acetic acid in dry pyridine yield 3-(2-benzo[d]isoxazol-3-yl-vinyl)chromon-4-ones 3. Further, 3-formylchromone 1 on heating with N-methylpiperizine in ethanol give 1-(2-hydroxyphenyl)-3-(4-methyl-piperazin-1-yl)propenones 4