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- Give out methods of preparation for cyclobutadienee complexsDescribe the species that would result from the subsequent transfer of the proton from the metal to one of the Cp rings of ferrocene. Give the formal oxidation state of the metal centre and the valence electron countWrite all the isomers of [PtCl(CO)(PMe3)(C2H4)]+ and use the trans directing effect of ligands to suggest the reaction pathways to synthesize the above isomers from [PtCl4] 2-
- Butan-1-ol can be oxidised by acidified potassium dichromate( VI) using two different methods. (a) In the first method, butan-1-ol is added dropwise to acidified potassium dichromate( VI) and the product is distilled off immediately. (i) Using the symbol [O] for the oxidising agent, write an equation for this oxidation of butan-1-ol, showing clearly the structure of the product.State what colour change you would observe. Equation ........................................................................................................... Colour change .................................................................................................. (ii) Butan-1-ol and butan-2-ol give different products on oxidation by this first method. By stating a reagent and the observation with each compound, give a simple test to distinguish between these two oxidation products. Reagent…Describe and map the reaction between Potassium dichromate (K2Cr2O7) and Sodium thiosulfate as a pentahydrate (Na2S2O3·5H2O). Show all products.Name the reaction and show the mechanism including the formation of show formation of an Si-F bond in the cleavage of the silyl group.
- One of the steps in fat metabolism is the hydration of crotonate to yield 3-hydroxybutyrate. This reaction occurs by addition of —OH to the Si face at C3, followed by protonation at C2, also from the Si face. Draw the product of the reaction, showing the stereochemistry of each step.For each of the following mixtures of reactants, give (i) a plausible chemical equation and (ii) structurefor the organometallic product, and (iii) general reason for the course of the reaction: (a)methyllithium and W(CO)6, (b) Co2(CO)8 and AlBr3.In an experiment, triphenylmethanol is prepared using the Grignard reaction. Reaction of bromobenzene with magnesium in ether produces phenylmagnesium bromide. This Grignard reagent then reacts with methyl benzoate to produce the corresponding alkoxide. Reaction of the alkoxide with aqueous acid then produces the alcohol. Give a plausible, three dimensional structure for the complex RMgBr-2(C2H5)2O. How do you think the ether molecules are bonded to the Grignard reagent?
- The following is an experimental account of the preparation of compound B from Phenylamine. 2cm3 of phenylamine are dissolved in 10cm3 of 0.5M hydrochloric acid in a test tube and cooled in an ice bath. 5cm3 of 0.2M sodium nitrate solution cooled to about 5o are added to the solution above and shaken. A salt A, C6H5N2Cl is formed, collected and dried. 1g of salt A is dissolved in 10cm3 of water, cooled and added drop by drop to a cold solution of 0.3g phenol in 5cm3 of 0.1M sodium hydroxide solution. B is precipitated, filtered, dried and the melting point determined. B is further crystallized twice and the melting point taken each time and found to be constant. Questions: (i) Give the name and suggest the colour of the precipitate B. Hence explain why it is necessary to recrystallize B several times. (ii) Why was it necessary to obtain a constant melting point for B?The following is an experimental account of the preparation of compound B from Phenylamine. 2cm3 of phenylamine are dissolved in 10cm3 of 0.5M hydrochloric acid in a test tube and cooled in an ice bath. 5cm3 of 0.2M sodium nitrate solution cooled to about 5o are added to the solution above and shaken. A salt A, C6H5N2Cl is formed, collected and dried. 1g of salt A is dissolved in 10cm3 of water, cooled and added drop by drop to a cold solution of 0.3g phenol in 5cm3 of 0.1M sodium hydroxide solution. B is precipitated, filtered, dried and the melting point determined. B is further crystallized twice and the melting point taken each time and found to be constant. 1g of phenylamine yielded 1.2g of compound A. Calculate the percentage yield of the reaction.The following is an experimental account of the preparation of compound B from Phenylamine. 2cm3 of phenylamine are dissolved in 10cm3 of 0.5M hydrochloric acid in a test tube and cooled in an ice bath. 5cm3 of 0.2M sodium nitrate solution cooled to about 5o are added to the solution above and shaken. A salt A, C6H5N2Cl is formed, collected and dried. 1g of salt A is dissolved in 10cm3 of water, cooled and added drop by drop to a cold solution of 0.3g phenol in 5cm3 of 0.1M sodium hydroxide solution. B is precipitated, filtered, dried and the melting point determined. B is further crystallized twice and the melting point taken each time and found to be constant. Why was it necessary to obtain a constant melting point for B?