15. Analytical Techniques:IR, NMR, Mass Spect

Draw the expected signal for a hydrogen with the following coupling constants.

(a) Hₐ : δ 5.34 (Jₐ꜀ = 12 , Jₐ₆ = 2)

Draw a splitting diagram for H_b, where

a. J_ba = 12 Hz and J_bc = 6 Hz.

Draw a diagram like the one shown in Figure 14.12 to predict

b. the relative intensities of the peaks in a quintet.

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Draw a tree diagram for H* in the structure below.

F₂CH*CH(CH₃)₂ J_H*-F = 50 Hz

J_H*-H = 7 Hz

The spectrum of trans-hex-2-enoic acid follows.

(a) Assign peaks to show which protons give rise to which peaks in the spectrum.

(b) Draw a tree to show the complex splitting of the vinyl proton centered around 7 ppm. Estimate the values of the coupling constants.

Draw a splitting diagram for the H_b proton if J_bc = 10 and J_ba = 5.

Using a 60-MHz spectrometer, a chemist observes the following absorption: doublet, J = 7 Hz, at δ4.00

(a) What would the chemical shift (δ) be in the 300-MHz spectrum?

(b) What would the splitting value J be in the 300-MHz spectrum?

(c) How many hertz from the TMS peak is this absorption in the 60-MHz spectrum? In the 300-MHz spectrum?

What coupling constant would you expect between Hₐ and H₆ in cyclopent-2-en-1-one?

Draw a splitting tree, similar to Figures 13-32 and 13-33, for proton H^c in styrene. What is the chemical shift of proton H^c?