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- Explain the mechanism-Carboxylation—Reaction of RMgX with CO2The cis and trans isomers of 2,3-dimethyloxirane both react with −OH to give butane-2,3diol. One stereoisomer gives a single achiral product, and one gives two chiral enantiomers. Which epoxide gives one product and which gives two?For the base-catalysed hydrolysis of 3-bromo-3-methylhexane (i.e. reaction with the nucleophile OH-): For the reaction intermediate, draw its structure and give the VSEPR description of the geometry at the reaction centre Give the names and draw the structures of the two reaction products. Explain your conclusions.
- [Rh(PPh3)3Cl] is a precatalyst that can be activated by dissociation of a phosphine ligand to form an active catalyst, B, which is used in the hydrogenation of alkenes. The active catalyst can then undergo oxidative addition in the presence of H2 to form complex C. Propene coordinates to C to form complex D, which then undergoes a 1,2- insertion step to form E. Reductive elimination of propane from E regenerates the active catalyst B. Draw complexes B – E and hence provide a full catalytic cycle, including the activation step, for the hydrogenation of propeneFor 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.a. What is the major product obtained from the reaction of propene and Br2 plus excess Cl-? b. Indicate the relative amounts of the stereoisomers that are obtained.
- What would be the expected major product when cyclooctene reacts with Cl2 in aqueous solution with H2O as the solvent?Write 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-Drawing on what you know about the stereochemistry of alkene addition reactions, a. write the mechanism for the reaction of 2-butyne with one equivalent of Br2. A. predict the configuration of the product of the reaction.
- Why cis-Ru(II)Cl2(DMSO)4 reacts with pyridine, et cetera, to give substitution of the DMSO but not the chloride ligands, but trans-Ru(II)Cl2(py)4 react with suitable Na+ and K+ salts in aqueous pyridine to afford chloride-substituted derivatives. write the reactions equations.A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under thesame conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C.Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structuresof A, B, and C; give equations for their formation; and explain the stereospecificity of these reactionsGiven the solution to Example 8.5, predict the structure of the product(s) formed when 3-hexene is treated with NBS.