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- Describe a sequence of reactions by which cis-2-pentene could be prepared from acetylene.An important step in one synthesis of carboxylic acids is the deprotonation of diethyl malonate and its alkyl-substituted derivative: Base CH;CH2O OCH,CH3 CH;CH,0 OCH2CH3 H2 Diethyl malonate Base CH;CH,0 °C `OCH,CH3 CH;CH,O OCH,CH3 R Alkyl substituted diethyl malonate NaOH can deprotonate diethyl malonate effectively, but NaOC(CH3)3 is typically used to deprotonate the alkyl-substituted derivative. Explain why.Ff.138.
- Hydroboration of Alkenes vs. Alkynes. Addition of an alkylboranes to a carbon- carbon double bond ("hydroboration") followed by oxidation is a common way to alcohols, for example, addition of dimethylborane to 2,3-dimethyl-2-butene yields 2,3-dimethyl-2-butanol. Me₂BH + Me₂C=CMe₂- →→ Me₂CH-CMe₂OH The reaction is more general as borane also adds to carbon-carbon triple bonds. obtain structures and energies for reactants and transition states for addition of dimethylborane (Me₂BH) to both ethylene and acetylene. Which reaction has the lower activation energy? Offer an explanation for your result.How would you synthesize the following compounds from benzene using reagents from the table? Reagents Cl2 1. NaOH / H2O 2. Hзо" CH3CI / AICI3 i a e CH3CI NBS / (PhCO2 b f Br2 / FeBr3 Cl2 / FeCl3 1. CO2 2. H3O* HNO3 / H2SO4 g k d NaCN KMNO4 / H3O* Mg / dry ether a) Phenylacetic acid, C¿H3CH2CO,H b) p-Methylbenzoic acid (p-toluic acid) Submit Answer Try Another Version 9 item attempts remainingMethyl isocyanate, CH3 -N= C = O, is used in the industrial synthesis of a type of pesticide and herbicide known as a carbamate. As a historical note, an industrial accident in Bhopal, India, in 1984 resulted in leakage of an unknown quantity of this chemical into the air. An estimated 200,000 people were exposed to its vapors, and over 2000 of these people died. Q.) Methyl isocyanate reacts with strong acids, such as sulfuric acid, to form a cation. Will this molecule undergo protonation more readily on its oxygen or nitrogen atom? In considering contributing structures to each hybrid, do not consider structures in which more than one atom has an incomplete octet
- Draw structures for compounds A through D. 1. NaOH, H2O A 2. H,0°A 1. NaOEt, EtOH (a) Ethyl acetoacetate → B 2. 1-Chloro-4-methylpentane Same as above 1. NaOH, H2O D 1. NaOC(CH3)3, (CH3);COH (b) A 2. 1-Chloropropane 2. H,0ºACCH H20, H2SO4 H9SO4 CH3 Alkynes do not react directly with aqueous acid as do alkenes, but will do so in the presence of mercury(II) sulfate as a Lewis acid catalyst. The reaction occurs with Markovnikov regiochemistry, so the OH group adds to the more highly substituted carbon and the H adds to the less highly substituted carbon. The initial product of the reaction is a vinyl alcohol, also called an enol. The enol immediately rearranges to a more stable ketone via tautomerization. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Hjö: -CH3 -CH3 H3O*Synthesize each compound from benzene. a. SO₂H 19일 g b. 00 이 H