Question

Please analyze Boc-protected alanine (first pic) and ethyl-ester protected tyrosine (second pic). Please confirm H labels and indicate chem shift, splitting pattern, and integration

V V H H Ha H HC H-O Ha He 2.0 5.5 5.0 4.5 4.0 6.5 6.0 3.5 3.0 2.5 7.0 Hpt He Ha 060 L 6.822 269 <.201 4.177 3.127

Answer 1

Ans: First pic is ethyl-ester protected tyrosine and Second pic is Boc-protected alanine.
d / Log NH, C HO V b Ha = 7.09 ppm, doublet, 2 protons Hb = 6.81 ppm, doublet, 2 protons Hc = HF = 4.69 ppm, singlet, 2 protons 4.20 ppm, multiplet, 2 protons Hg = 3.12 ppm, triplet, 3 protons

OH NH Y b 11.21 ppm, singlet, 1 protons Ha = Hb = 6.92 ppm, singlet, 1 protons Hc= Hd = 5.19 ppm, singlet, 1 protons 4.14 ppm, singlet, 3 protons 1.42 ppm, singlet, 9 protons He =