Experiment C. Aim: To protect one of two carbonyl groups (C1) in order to allow the other to react twice with a Grignard followed by removal of the protecting group by acid hydrolysis to give final product (C2). Method: Ethyl acetoacetate (30.03g)‚ ethylene glycol (15.01g) and toluene-p-sulphonic acid (0.13g) were added to a 250 cm3 round bottomed flask‚ containing a stirrer bar and toluene (100 cm3)‚ fitted with a condenser and dean-stark head. Solution was heated strongly under reflux using
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A- HPTLC Flavonoid profile of methanol extract M. concanensis leaves B- HPTLC Flavonoid profile of methanol extract M. concanensis flowers C- HPTLC Flavonoid profile of methanol extract M. concanensis seeds 4.2.3.1 C) HPTLC Phenol profile of M. concanensis Nimmo. HPTLC finger printing of M. concanensis was done by using selected solvent system Chloroform: Ethyl acetate: Formic acid (50%:40%:10%v/v) for leaf‚ flower and seed extracts‚ visualized under UV 254 and 366 nm showed more
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an useful organic reaction. This reaction is named after a British chemist Sir Robert Robinson. The term ’annulation ’stands for ’building a ring ’. In this reaction‚ the formation of α‚ β-unsaturated cyclic ketones from methl vinyl ketones and aldehyde or ketones takes place. Actually this reaction is a combination of two reactions. One is ’Michael Addition ’ and the other is ’Aldol Condensation ’. Robinson Annulation Mechanism In the first step‚ Micheal addition takes place to an α‚β-unsaturated
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EXPERIMENT 1: REACTIONS OF ENOLATE IONS WITH CARBONYL GROUPS Aims In this experiment we used two techniques for the reactions of enolate ions with carbonyl groups. One technique used was Doebner reaction and the other technique used was Claisen-Schmidt reaction. Therefore the aim of this experiment is to synthesize trans p-methoxycinnamic acid and to synthesize dibenzalacetone via an aldol condensation reaction between acetone and benzaldehyde. The products would be recrystallized using ethanol
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Clays are one of the important natural materials‚ which have been examined for catalytic applications. Clays are characterized by a layered structure and hence they are slippery when wet. They are broadly classified as cationic or smectite type (having layer lattice structure in which two-dimensional oxyanions are separated by layers of hydrated cations) and anionic or brucite type (in which the charge on the layer and the gallery ion is reversed complimentary to smectite type). Anionic clays are
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In this experiment‚ the production of a Grignard reagent (phenylmagnesium bromide) was performed from a bromobenzene reactant combined with magnesium and ether. Phenylmagnesium bromide was then transformed into a tertiary alcohol called triphenylmethanol‚ through addition of another compound called benzophenone‚ as well as additional ether. The end product of triphenylmethanol was analyzed via NMR and IR. Figure 1: Preparation of the Grignard agent by combining bromobenzene with magnesium and ether
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B. Chromic Acid Test/ Jones Oxidation This test is based on the reduction of chromium(IV)‚ which is orange‚ to chromium(III)‚ which is green‚ when an alcohol is oxidized by the reagent. A change in color of the reagent from orange to green represents a positive test. Primary alcohols are oxidized by the reagent to carboxylic aicds; secondary alcohols are oxidized to ketones. Tertiary alcohols are not oxidized at all by the reagent. Hence‚ this reaction can be used to distinguish tertiary alcohols
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THEORY: The Diels-Alder cycloaddition reaction was discovered by Otto Diels and Kurt Alder and is very useful in the synthesis of polycyclic compounds. The Diels-Alder reaction can be described as: [4+2] cycloaddition- a diene with 4 π electrons + 2π electrons from the dienophile; a pericyclic concerted reaction- meaning the reaction occurs in a single step (no intermediates) and involves a cyclic redistribution of bonding electrons. In order for a Diels-Alder reaction to take place
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Aldol Condensation Wei-Hsuan Tsui 4/16/14 The reaction of an aldehyde with a ketone employing sodium hydroxide as the base is an example of a mixed aldol condensation reaction‚ the Claisen-Schmidt reaction. Dibenzalacetone is readily prepared by condensation of acetone with two equivalents of benzaldehyde -26 -95 113.9 1. Weigh 0.212 g of pure benzaldehyde directly into a 10 x 100 mm reaction tube. 2.
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Tetraphenylcyclopentadienone Joshua Krank Principles of Organic Chemistry Laboratory‚ Department of Chemistry and Biochemistry North Dakota State University‚ Fargo‚ ND 58102 Introduction: The purpose of this experiment was to synthesize tetraphenylcyclopentadienone using a reaction of dibenzyl ketone (1‚3-diphenyl-2-propanone) with benzil in the presence of base. The reaction then proceeded with an aldol condensation reaction.5 This product was obtained using extraction (reflux)‚ recrystallization
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