Question

3.03 3.00 1.97 2.00 CH,CH-C. 0-CH.CH TT Chemical shift (ppm) FIGURE 22.11 'H NMR spectrum of ethyl propanoate at 200 MHz.

Use this to estimate the Chemical shift of the two new alkene protons of the wittig product:

Answer 1

- Det ac - okt Phez P - CA 4 1101 15 undn. cooBA - P, Peo Wittig Product Triphenyl phosphine oxide. This in the balanced equation. Here you have not mentioned about your 7 yeild If it in a. so I can't go Sar yield calculation. Ha to • From the NMR of Chinch-crochette Chemical stuft of Ha, te prokon aull appear out the wittig products wmr. And ta analt shou quantret at around 4 ppm. and te mell shom triplet at around a pon. But the alkene proton will come around 6-8 ppon range. And in wittug poht. H, caill be rem shisted around 6 ppm and H2 will be more chisted around 8 ton. due to ring current and magnetic anisotropic esteet of anthracene ring and cao group respectively, But most significant point anell be the coupling

constant between He and t₂, J = 16 Hz awhich will directy tell about the trans ar 'E' product.