Preparation and Reactions of

When Cr(III) nitrate is boiled with the sodium salt of EDTA, a complex is formed in which a water molecule occupies the sixth coordination position of the Cr(IlI). The rate of oxidation of EDTA by permanganate is reduced when it coordinates to a metal ion e.g. Cr(III). It is interesting to investigate the effect of Bi(IIl) on the rate. 

Prepare 5 x 10 M solution of purest EDTA (disodium salt) and 5 x 10 M solution of purest Cr(III) nitrate enneahydrate in water. Mix equal volumes of the two solutions in a flask provided with an upright water-cooled condenser. Heat to boiling until maximum colour change takes place. Dilute an aliquot to obtain a 0.01 M solution of the Cr(IIl) complex. Quickly mix 20.0 cm of this solution with 0.4 cm of 0.02 M permanganate solution and 20.0 cm M sulphuric acid and make up to 200 cm. Fill a 1 cm cell with the mixture and measure the absorbance at 545 at short intervals. In some instruments the kinetic plot is recorded. Otherwise plot absorbance against time. Repeat the kinetic run but replace the sulphuric acid by 20 cm of 0.01 M Bi(III) nitrate in 1 M sulphuric acid and plot absorbance against time. What conclusions can be drawn from your results  

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This chapter concerns the preparation and reactions of acyl chlorides acid anhydrides thioesters esters amides and nitriles These com pounds are generally classified as carboxylic acid derivatives and their nomenclature is based on that of carboxylic acids... 

Contents Introduction and Principles. - The Reaction of Dichlorocarbene With Olefins. - Reactions of Dichlorocarbene With Non-Olefinic Substrates. -Dibromocarbene and Other Carbenes. - Synthesis of Ethers. - Synthesis of Esters. - Reactions of Cyanide Ion. - Reactions of Superoxide Ions. - Reactions of Other Nucleophiles. - Alkylation Reactions. - Oxidation Reactions. - Reduction Techniques. - Preparation and Reactions of Sulfur Containing Substrates. -Ylids. - Altered Reactivity. - Addendum Recent Developments in Phase Transfer Catalysis. 

Donald J Burton and Jerry L Halinfeld, The Preparation and Reactions of Fluoromethylenes... 

Preparation and Reactions of Polyfluorinated Aromatic Heterocyclic Compounds Yakobson G G, Petrova, T D, Kobnna, L S Fluorine Chem Rev 7, 115-223 285... 

The Preparation and Reactions of Fluoromethyleiies Fluorinated Isocyanates and Their Denvatives as Intermediates for Biologically Active Stibsianccs (Ccr) Radical Reactions of Polyfliioroaromatic Compounds (Russ )... 

Preparations and reactions of inorganic main-group oxide fluorides. J. H. Holloway and D. Lay-cock, Adv. Inorg. Chem. Radiochem., 1983,27,157-195 (342). 

This section covers the preparation and reactions of quinoxalinecarboxylic esters, generally the most convenient derivatives of quinoxalinecarboxylic acids. 

Scheme 3.4. Preparation and Reactions of Active Acylating Agents...

Dallacker, F. Eisbach, R. Holschbach, M. Derivatives of vitamin E series 1. Preparation and reaction of all-rac-5-formyl-y-tocopherol. Chem. Ztg. 1991, 115(4), 113-116. 

Our requirements for certain applications called for the preparation of block copolymers of styrene and alkali metal methacrylates with molecular weights of about 20,000 and methacrylate contents of about 10 mol%. In this report we describe the preparation and reactions of S-b-MM and S-b-tBM. In the course of our investigation, we have found several new methods for the conversion of alkyl methacrylate blocks into methacrylic acid and/or metal methacrylate blocks. Of particular interest is the reaction with trimethylsilyl iodide. Under the same mild conditions, MM blocks are completely unreactive, while tBM blocks are cleanly converted to either methacrylic acid or metal methacrylate blocks. As a consequence of this unexpected selectivity, we also report the preparation of the new block copolymers, poly(methyl methacrylate-b-potassium methacrylate) (MM-b-MA.K) and poly(methyl methacrvlate-b-methacrylic acid) (MM-b-MA). 

Preparation and Reactions of S-b-MM. As mentioned in the introduction, we were interested in block copolymers of styrene and alkali metal methacrylates with overall molecular weights of about 20,000 and methacrylate contents on the order of 10 mol%. The preparation of such copolymers by the usual anionic techniques is not feasible. An alternative is to prepare block copolymers of styrene and methacrylic esters by sequential anionic polymerization, followed by a post-polymerization reaction to produce the desired block copolymers. The obvious first choice of methacrylic esters is methyl methacrylate. It is inexpensive, readily available, and its block copolymers with styrene are well-known. In fact, Brown and White have reported the preparation and hydrolyses of a series of S-b-MM copolymers of varying MM content using p-toluenesulfonic acid (TsOH) (6). The resulting methacrylic acid copolymers were easily converted to their sodium carboxylates by neutralization with sodium hydroxide. 

Preparation and Reactions of S-b-tBM. S-b-tBM copolymers were prepared in exactly the same manner as that described above for S-b-MM. Characterization by 1H NMR confirmed the presence of the t-butyl... 

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