Identify the type of pericyclic reaction shown below: O sigmatropic rearrangement. O electrocyclic reaction. O cycloaddition reaction. Save for Later
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- biackboard.gwu.edu/webapPps/assessment/feview/review.jsprattempld Select the major product of the reaction below. 1) TIPSCI, Et3N 2) Na 3) 03, then CH3SCH3 4) CH3CH2LI, then H30* 5) Bu4N* F', H2O CI Selected Answer: Он HO Answers: он он он OH OH OH он Select the major product of the reaction below. The answer is there, but please explain step by step.b) Which of these dienophiles gives the FASTEST reaction with cyclopentadiene? CH2 CH2 A. | В. С. || D.Give the structure of compound A, the major product when the reaction is conducted at low temperatures. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. View Available Hint(s) H 20 EXP. CONT. L C N S CI -55 °C Br Marvin JS Н — Вr [1] A by O ChemAxon F A O
- Cambridge International AS Level Chemistry ot boe slo plgmes s al snsdismonooli End-of-chapter questions 1 1-bromobutane will undergo reactions when heated, as shown by reactions A and B. ot dwab on s bl auoltse s boaub svsd 20 swoll gab ods-suai la yel snoso sdr ssiganm n2 monl gnivims noiteibar VU luad CH;CH,CH,CH,Br B CH;CH,CH,CH,OH CH;CH,CH=CH, 90u S1s 2O1D Isdh tuo gomia sli ni qu dgid tod a guch pecoue For reactions A and B give the reagents used in each case. b Reaction A was repeated using 1-iodobutane instead of 1-bromobutane. Explain any difference in the rate of reaction observed. p bas- od mon c What type of organic reaction is A? d Show the mechanism for reaction A. e Reaction A was repeated with 2-bromo-2-methylpropane instead of 1-bromobutane. i Name the organic compound formed. elle ii The mechanism of the reaction with 2-bromo-2-methylpropane differs from the mechanism of smitas nosd asd i anol reaction A. Describe how the mechanisms differ. f What type of reaction is…c. Snl reactions dominate under polar protic solvents. Increasing the polarity of the solvent will increase the rate of the reaction because the polar solvent will stabilize the dispersed charges on the transition state more than it will stabilize the neutral reactant. Label areas of ô* and & on the molecules of the transition state of the SN1 reaction below: Me Me Ме Me Me H20 Br -Br OH + НО \'H Et Et RDS Et H Et Et transition state not isolable carbocation intermediate not isolableIn each reaction box, place the best reagent and conditions from the list provided. 1) Br 2) 3) DEET (the active ingredient in over the counter insect repellant) 4) 5) Answer Bank Mg. Et,0 CH,CH,OH НСООСH, H,CO НСООН NH(CH,CH,),(2 equiv.) Br,, FeBrz CH,COOH HN(CH,CH,), (1 equiv.) NaNH, H,0+ CH,CH,NH, CO, CH,CH, Br SOC, NaCN
- 01:50 4G File Details 4CH003/UM1: Fundamentals of... Introduction NaBH4 OH C=0 H benzophenone diphenylmethanol Ketones are readily reduced to secondary alcohols by reaction with sodium borohydride. The aim of this experiment is to determine the time required to effect the complete conversion of the ketone, benzophenone to diphenylmethanol at room temperature. This investigation may be achieved by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, eithert = 2.5 minutes,…H3C a. (6 points) Provide the curved-arrow mechanism for the first halogenation reaction; reaction intermediates are provided. H H e.. : OH Na H₂C H :|-| H3CConsider the cyclization reaction mechanism that is partially detailed below and predict the structures of key intermediates. Only draw resonance structures with carbanions and not oxyanions. G CH;00C [1] NaOCH3 [2] H2O COOCH3 Na* :OCH3 H H- CH;ö. :0: :0:
- What reagents are suitable to carry out the conversion shown? cyclohexene trans-1,2-cyclohexanediol O KMNO.. N2OH,H,0 KMNO4, H3O“, 75°C O H;SO4, heat 1. MCPBA; 2. H3O* O none of these7. Reaction Scheme. NH₂ NH2 or two differnet methods (no same steps/reagents) C5H12N2 1. xs Mel, xs K2CO3 2. Ag2O, H₂O 3. heat Br2, xs NaOH, xs H₂O OHC 1.03 2. DMS CHOps/assessment/take/launch.jsp?course_assessment_id%3D_10030_1&course_id%3D_58621_1&content_id%3D 221089 1&step= Remaining Time: 46 minutes, 58 seconds. * Question Completion Status: O Rearrangement reaction. QUESTION 13 The AG° (free energy change) for the conversion of A to B is predicted to be which of the following? CI OOH2 H20 + CI CI H-CI step 1 A step 2 step 3 B O AG° = 0 O AG° 0 O Cannot be determined from the information provided O It can be determine from the type of reaction QUESTION 14 Save All Answers Click Save and Submit to save and submit. Click Saue All Answers to save all answers. 19°C Type here to search 近