Rank the indicated protons below in order of increasing ppm on a 'H-NMR. нь Н. она,...
Below is the structure of ephedrine. Predict the 1H NMR chemical shift for all the hydrogen’s labelled in the structure below: ОНа На He H HcN. Нь Chemical shift (ppm) Hydrogen На Нь Н. Не エエ
2. Rank the indicated protons in increasing order of chemical shift. Fill in the boxes with the correspondants letters to the indicated hydrogens. Explain your choice of chemical shifts for protons H. and H. (6 points)
Нь He Ha -CEC Hd a) Given that the 'H NMR spectrum was acquired at 300 MHz, convert the ppm values for the alkenyl region to Hz and provide the cis proton coupling constant to 1 decimal place. b) Please provide the chemical shift values for Он i) Both alkyne carbons ii) The aromatic carbon bearing the substituent ili)H vi) H v) He iv) H H NMR spectrum 7.50 745 740 7.35 6.0 58 S.6 n (ppm) S4 52 75...
Classify the indicated protons in order of chemical displacement, where #1 is the smallest chemical displacement, and #5 is the highest chemical displacement Classez les protons indiqués par ordre croissant de déplacement chimique où le numéro 1 représente le déplacement chimique le plus petit et le numéro 5 le déplacement chimique le plus élevé: N. HN' He на нь Há H. 15 Ha He < Hd He < нь
34 2h H-NMR Spectrum of Ester A НЕ НЕ на PPM tr H-NMR Spectrum of Product B НЕ зН зн на НL 0 PPM ) Write a comple te curved arrow mechanism for the bromination reaction below. Include the formation of all intermediates (10 points). нооно а 5) Name the following molecules (8 points total). но, (q 6) When an ester A is treated with one equivalent of sodium methoxide, product B is formed. The 'H-NMR spectra of A and...
Assign the hydrogen atoms Ha - Hd to the chemical shifts in the spectrum below. С,Н,S 300 MHz H NMR in CDCI3 Source: Aldrich Spectra Collection/Reich g нн s- a d 3.00 нн b 2.04 2.05 0.96 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 ppm На [Choose] 2.51 ppm 0.85 ppm 1.33 ppm НЬ 1.64 ppm Нс Choose Hd Choose] I-
Gluconic acid (shown) is a natural, Bronsted acid found in honey. Rank the labeled protons in order of increasing acid strength - i.e. from least acidic to most acidic site. a ОН ОН с НО. 9 OH OH ОН Н ОН b Gluconic acid least acidic c <b<a most acidic least acidic b <a<c most acidic least acidic a <b< 0 most acidic Olеаѕt acidic с <a<ь most acidic
2. (0) Rank the indicated protons in order of DECREASING acidity. Give reason for your choice. H2 (ii) Rank the following anions in order of INCREASING basicity. Explain your choice.
In each compound below, two protons are clearly identified. Determine which of the two protons is more acidic. он н . NH2 Но (a) (b) (c) SH но (d) (e) (f) H но ОН (h)
2) Order the following alkenes from most stable to least stable Нас Нас с-сн, н,с Hас +C- Нас н CHs -CH3 H Hе most stable least stable (a) I (b) I (c) I ll (d) 7) Order the following C-H bonds from strongest to weakest. strongest weakest (a) (b) (c) II (d) 8) Which of the following is represents the lowest energy transition state for the addition of BH, to 2-methyl-1-propene? quCH «сHs нСи Нас (b) (a) Нив--н H H...