Microwave Synthesis of 5‚10‚15‚20- Tetraphenylporphyrin Abstract: In this green chemistry experiment of 5‚10‚15‚20-tetraphenylporphyrin was synthesized from benzaldehyde and pyrrole. using microwave irradiation to heat the reactants.‚ The liquid reactants are absorbed on a solid support‚ silica gel‚ which acts as a Lewis acid catalyst to facilitate the reaction. The reaction forms a porphyrinogen‚ which is then oxidized to the porphyrin product by atmospheric oxygen. Column chromatography is performed
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meso-tetraphenylporphin (TPP) and its copper‚ cobalt or zinc complex by condensing benzaldehyde with pyrrole in boiling propanoic acid. II. Introduction and Background There are two types of proteins that function as oxygen carriers: myoglobin (stores the oxygen) and hemoglobin (present in red blood cells and is responsible for oxygen transport). The heme unit is a planar macrocyclic organic molecule that is made of four linked pyrrole rings surrounding an iron atom. These types of macrocyclic‚ nitrogen-containing
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Why do some people believe that the market system is the best mechanism for allocating scarce resources and thereby encouraging a positive investment climate? Explain your answer There are three different types of ways of allocating scarce resources which are pure market economy‚ pure command economy and mixed economy. (Griffiths‚ Wall‚ 2008) Some people believe that the free market is the best mechanism for allocating scarce resources. A pure command economy is an economy in which the government
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than a passive mechanism for recording external information. Evaluate this claim‚ making reference to research findings. The concept that the memory is a constructive and dynamic system was originally introduced by Sir Frederic Bartlett‚ in the 1920’s. According to Bartlett‚ social factors influence one’s ability to remember‚ and in turn‚ can either change a person’s perception of a specific memory or distort the original memory. As opposed to the memory being a ‘passive mechanism’ which indicates
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Memory is a constructive and dynamic system rather than a passive mechanism for recording external information. Evaluate this claim‚ making reference to research findings. In order to evaluate this claim it is necessary to look at some of the research that has been carried out on memory. Most of the relevant research findings support the theory that memory is indeed a constructive and dynamic system but how much of what we store in our memory is down to active and conscious energy and how much
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Prelab 5B Macrocyclic Synthesis OBJECTIVE: The objective this week is to produce Tetraphenylporphyrin and its metal complex. This will be carried out by condensation of 4 equivalents of Benzaldehyde and pyyrole in the presence of propanoic acid. The product will undergo UV/Visible Spectrum tests to determine its lambda max. The lambda max will show us the relationship between a conjugated system and the visible spectrum. PROCEDURE: Step 1: preparation of meso-tetraphenylporphyrin (TPP)
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greater understanding of the scientific applications surrounding Tetraphenylporphyrin (TPP). In order to generate TPP‚ the group has elected to use the procedure outlined in Bozak & Hill. This requires adding equal parts of distilled pyrrole and reagent grade benzaldehyde together in a round bottom flask in propionic acid. This solution is then refluxed for about 30 minutes and the precipitate is dried by suction filtration. This product will be analyzed and classified by UV-Vis‚ FT-IR‚ and H1 FT-NMR
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Quiz #1 Attempt 1 Written: Jul 7‚ 2012 9:48 AM - Jul 7‚ 2012 9:50 AM Submission View Your quiz has been submitted successfully. Question 1 1 / 1 point At what time do you have to complete your online prelab assignment to be allowed to participate in the lab? Question options: A week before the lab Day before the lab at 10 pm The morning of lab day at 8 am One hour before the lab Question 2 1 / 1 point Which materials/chemicals belong in the desiccator? Question options: Drying
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Therapy‚ Physiotherapy & Speech therapy services with in an NHS region. The region covers a General Acute hospital‚ Rehab hospital as well as an Elderly hospital In your capacity as a Financial Controller you are requested to explain what mechanisms would you adopt to: (a) Ensure regular monitoring of the business (b) alert respective internal stakeholders particularly when an adverse variance seems probable Articulate also which information would you make use of to achieve (A) and (b)
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segment .The first parts would consider the introduction which would talk about the concept of religion and that of social control. In the same section I would also consider the position of Ross as stating that religion is a more social control mechanism that enacted laws of society. The second and third part would look at how these religious elements would or can inform crime prevention and last the conclusion respectively. By definition religion has been defined by many scholars in various
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