Concept explainers
(a)
Interpretation:
The detailed mechanism for the given reaction, with major product, is to be drawn.
Concept introduction:
The
(b)
Interpretation:
The detailed mechanism for the given reaction, with major product, is to be drawn.
Concept introduction:
The alkynes are electron rich system like alkenes and can undergo electrophilic addition reaction with strong Bronsted acids just like the alkenes do. The reaction proceeds with proton transfer reaction to form a stable carbocation, followed by the action of water as a nucleophile. In excess of reagent, the reaction occurs twice, forming a geminal dihalide compound as a major product.
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Organic Chemistry: Principles And Mechanisms: Study Guide/solutions Manual (second)
- Which of the following would be the expected major product and why? HCI CI II CI Product I because of resonance stabilization of the carbocation intermediate Product II because of resonance stabilization of the carbocation intermediate Product I because of inductive stabilization of the carbocation intermediate Product II because of inductive stabilization of the carbocation intermediatearrow_forwardNonearrow_forward9.20 How many ¹H NMR signals (not peaks) would you predict for each of the following compounds? (Consider all protons that would be chemical shift nonequivalent.) OH Br OHarrow_forward
- 9.22 Propose a structure for an alcohol with molecular formula C5H12O that has the 1H NMR spectrum given in Figurearrow_forwardFor each set of carbonyl additions, circle the carbonyl addition that occurs at the faster rate (assuming everything is the same except that the reagent/substrate differs - i.e., same temperature, and ratios/concentrations of reagent and substrate). Electrostatic attraction has a greater impact on the relative rates than steric hindrance. (a) CH3OH HO OCH3 H H CH3 i CH₂OH HO OCH 3 H F3C CH3 (b) F3C NaOCH3 HO OCH3 H3C CH3 H3C CH3 CH3OH HO OCH3 H3C CH3 H3C CH3 (c) NaSCH3 OSCH 3 H3C CH3 H3C CH3 NaOCH3 O OCH 3 H3C CH3 H3C CH3arrow_forward9.34. Assign the chemical shifts and splitting patterns to specific aspects of the structure you propose. C5H12O 1H 2H 2 6H ille H(ppm) 1 3H и 0arrow_forward
- HO (c) (1 pt) Both of the following are hydride donors. Circle the harder nucleophile of -P-Cu-H Н H-AI-H HINIH Н (d) (4 pts) The following reaction involves two steps. Draw the anionic intermediate that forms after sodium hydride reacts and the final organic product. Hints: what type of nucleophile is NaH and where does that mean it will react? Also, the second step is not a proton transfer. What's the most likely reaction for that intermediate to undergo? NaH anionic intermediate final productarrow_forwardPredict the product(s) for the reaction shown. O excess HBr heatarrow_forwardPlease help graph these plotts belowarrow_forward
- Please graph the image below:arrow_forward7. Our textbook says that the fragmentation that occurs in the mass spectrometry of alkanes can be understood by realizing that "the differences in energy among ... tertiary, secondary, primary and methyl carbocations in the gas phase are much greater than the differences among comparable radicals. Therefore, where alternative modes of fragmentation are possible, the more stable carbocation tends to form in preference to the more stable radical." Given this information, which one of the following hexane isomers (all C6H14) is most likely to have a strong M-15 peak (that is, a peak at m/z 71)? HINT: You're looking for a compound that forms a 3° carbocation after loss of an electron and a CH³· radical. A) n-hexane D) 2-methylpentane B) 2,2-dimethylbutane E) 3-methylpentane C) 2,3-dimethylbutanearrow_forwardPlease help graph these plots below:arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning