1 / 15

APPLICATIONS

APPLICATIONS. Microwave heating is able to heat the target compounds without heating the entire furnace or oil bath This saves time and energy.

lucy-fulton
Télécharger la présentation

APPLICATIONS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. APPLICATIONS

  2. Microwave heating is able to heat the target compounds without heating the entire furnace or oil bath • This saves time and energy. • However, due to the design of most microwave ovens and to uneven absorption by the object being heated, the microwave field is usually non-uniform and localized super heating occurs

  3. Microwave heating can have certain benefits over conventional ovens: • reaction rate acceleration • milder reaction conditions • higher chemical yield • lower energy usage • different reaction selectivities 

  4. It is time saving • Increased reaction rates 1000 fold in best cases • Used to accelerate chemistry in both solution &solid phase reaction • Improved product yields • It can be conducted in either open or closed vessels

  5. Access to synthetic transformations not achievable via conductive heating • Broad dynamic temperature range (45˚c-300˚c) • Green chemistry- reactions in supercritical water or solvent – less reaction • It can be used to accelerate the synthesis of peptides • It is used for parallel synthesis.

  6. Controlled method of heating • Rapid reaction optimization • In organic reactions many reactions has now performed through microwave heating EXAMPLES: Acetylation reaction, Alkylation, Coupling reaction, Condensation reaction, Diel’s alder reaction, Elimination reaction etc

  7. Heterocyclic Nucleus Synthesis Microwave is used in synthesis of • Five-Membered Heterocyclic Rings- Pyrroles, Pyrazoles, Imidazoles, Oxazolines, Triazoles , Isoxazolines etc • Benzo-Derivatives of Five-Membered Rings- Benz-imidazoles, Benz-oxazoles, Benz-thiazoles etc • Six-Membered Rings- Dihydropyridines, Tetrazines, Dihydropyrimidines

  8. Polycyclic Six-Membered Rings- Quinolines, Pyrimido [1, 2-a] pyrimidines • Heterocyclic C-Alkylations, Heterocyclic N-Alkylation’s, Nucleophilic Substitutions, Hetero-Diels-Alder Reactions, Intramolecular Reactions, Intermolecular Reactions, etc

  9. Synthesis of phenytoin by conventional&microwave • In conventional synthesis 2 hrs reflux is needed • In microwave synthesis only 15 minutes is needed • Yield is better in microwave synthesis than in conventional synthesis.

  10. Miscellaneous Microwave assisted Extraction Microwave Ashing Microwave drying

  11. The instrumentation developed for MAOS has more recently found application in what has been traditionally termed the biosciences. These areas include peptide synthesis proteomics and DMPK (dystrophia myotonica protein kinase) .

  12. Recent publications in the field of proteomics have shown the instrumentation used for MAOS can • be used to accelerate tryptic digests with the total time reduced from hours to minutes with a concomitant improvement in coverage. • Highthroughput proteomic applications may require the development of plate-based instrumentation to facilitate the work flow.

  13. APPLICATION IN A GIVEN TEMPERATURE RANGE Coupling reaction Susbstution reaction etc 80-250˚c Super critical water green chemistry Ring expansion -45˚c

More Related