A proton (H*) from trifluoromethanesulfonic acid, CF3SO2OH, can add to the alkyne shown to yield two different carbocation products. (a) Draw the mechanism for each of these steps, along with the corresponding products. (b) Which carbocation is more stable? H3C C-c=CH H2 + H-OSO,CFз ? H2
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- (a) Rank the following carbocations in order of increasing electrophilicity (1 = lowest electrophilicity, 4 = highest electrophilicity). (b) Rank the following 1,1-halomethylcyclopentanes in order of reactivity in an SN1 reaction (1 = lowest reactivity, 4 = highest reactivity. CH3 CI B with SNI, nor reactive means more stable (c) Rank the following species in terms of increasing nucleophilicity in an SN2 reaction in a po aprotic solvent (1 = lowest nucleophilicity, 4 = highest nucleophilicity).In the presence of light or heat, diazomethane (CH,N2) creates a carbene, which then adds to an alkene to make a cyclopropane. In the boxes below. draw the mechanism arrows for the reaction. H INEN: INE N:Dehydration of 1,2,2-trimethylcyclohexanol with H2SO4 affords 1-tert-butylcyclopentene as a minor product. (a) Draw a stepwise mechanism that shows how this alkene is formed. (b) Draw other alkenes formed in this dehydration. At least one must contain a ve-membered ring.
- Consider the following mechanism of reaction: CH3 CH, CH3 CH;C CH, + H-CI CH;CCH, + C: → CH;CCH, tert-butyl cation CI tert-butyl chloride In this reaction: The alkene and the carbocation intermediate are both nucleophilic HCl and CI" are both nucleophilic The alkene and HCI are both electrophilic The carbocation and CI" are both electrophilic The alkene and CI" are both nucleophilic AMeving to another question will save this responseThe reaction shown here produces two isomers with the formula C,H11Br. (a) Draw each product. (b) Draw the mechanism that accounts for the formation of each product. conc HBr 2 products C,H,1Br12) Use the curved arrow formalism to show the movement of electron pairs in the following reaction and label each reactant as a nucleophile or an electrophile. CHÍNH CHỊCH, + CO Học Nha CH₂CH₂CI
- (c) The following reaction shows the electrophilic addition reaction between an alkene compound with hydrogen chloride, HCI. Tindak balas berikut menunjukkan tindak balas penambahan elektrofilik antara sebatian alkena dengan hidrogen klorida, HCI. CI + HCI Major product Draw the mechanism for the formation of major product.When treated with NaOH, the bromide below gives an alkene by the E2 mechanism, by elimination of the H atom indicated by the arrow: (a) Draw the Newman projection from which elimination takes place. (b) Draw the mechanism. (c) Draw the product with the proper stereochemistry. (d) Assign the proper stereochemical descriptor to the product. (e) Give the rate equationComplete the following reactions by providing the missing product(s). Determine what mechanism operates in each case (SN1, Sn2, E1, or E2), Show the stereochemistry of the product(s) where appropriate. If more than one product us formed circle the major one. Br H,O Br NaOCH;CH;
- (a) What product(s) are formed when the E isomer of C6H5CH = CHC6H5 is treated with Br2, followed by one equivalent of KOH? Label the resulting alkene(s) as E or Z. (b) What product(s) are formed when the Z isomer of C6H5CH = CHC6H5 is subjected to the same reaction sequence? (c) How are the compounds in parts (a) and (b) related to each other?5) 2-methyl-1,3-cyclohexadiene is treated with 1 equivalent of HCl. There are two major products. One product predominates at high temperature, and the other at low temperature. HCI a) Write the mechanism for this reaction. b) Label one product as the high temperature product and one as the low temperature product.1. Draw the structure of all reactants and product for the following reactions. (a) 2-methyl-1-iodocyclopentane + NaOCH3 ------>A (b) A + (1) Hg(OAc)2, H2O/(2) NaBH4 ------>