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Midterm 2 chem 109b

Midterm 2 chem 109b - Cassidy’s Chem 1093 P’ractice...

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Unformatted text preview: Cassidy’s Chem 1093 P’ractice Midterm II “I tried to give a fair representation of all of the reactions and concepts we have covered but it is impossible to have one packet with everything, so please, please review your lecture notes, my notes and your book for further yractice and understanding. GOOD LUCK!“ 1. Give the name or draw the following: 53H WWd‘ am 3:! c. _ om exam e flow w P H 1‘. an enamine g. a hemiacetal h. j. urea k. l. malonic acid 2. indicate which of the following reactions occurs the fasters (F) and why. Indicate which of the following reactions occurs the slowest (S) and Why. Place all in numerical order from fastest to slewest using 1 as the fastest. ‘ l w leg- 2 3Q; :) CHslmg E} V“ i) $439+ “33$ . 1) CH WE?” " ‘NHZ‘ a) H304” ? WEEK 9% For Jrhese @963 b. (343309543 H410 03— wamms‘ gou c3 H 0+ Should also wow CchNH CH3, how +0 draw W! . 3* diagram expimnffl9 ? f? ‘ {430+ WW cmst Wan‘ QHSSOCOHB m HMS,” Polwf Pn‘flCAP'Q ‘ 9 0315mm mvféwl ll 3. Why are th‘ioesters like acetyl coenzyme A, CH3”ng more reactive in nucleophilic addition to the carbonyl than normal oxygen esters? 3. Write the missing reagent(s), for the following reactions (may be more than one reaction step) Q A (gas-s d / \ mgwwgwm-eQ‘WCH M ... was: M 0 4. éDEfifid (fin—H m 02:29 OiB Creel =31? [xx—N 7191-3 eweee Net-{WE ' -5. 6. a. b. Calculate AH and AG for the feilowing mechanism. First calculate from the reactants t0 the neutra! tetrahedral intermediate and then to the finai products from the intermediate. KEHQ-Hg. m H :H"H ximfi4fle H efiflfljk Explain as best you can Why you wouid get a majority of the 1,2 preduct from a reaction of an a,fi-unsaturated aldehyde with a grignard reagent as shown beiew. Use words AND energy diagrams. H 0043 mg 93V; “K '2.) H3 “(133: v: H majW Give mechanisms for the following: “F0 k NHzeIHwHujfge) g: H (we): - H0"; A )LWB H20 >43 (my); ‘ 7. Predict the main products or give the missing reagents for the following \ reactions. Show appropriate stereechemistry if necessary. meue/nge w “h? thaz) cover (MA WWW“ 9m “39+ @ "\‘O \0 n9 _ “be my ask. a, queshm W I moa WM! H10 b ()HOWH W (03 jig W‘9 “W ...
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