Question

synthesize of 3,3-dimethyl-1,2-epoxybutan

Identify the relevant peaks in the FTIR spectrum and record the position and associated functional group for each in the FTIR table below:

BP: FTIR Common Name: IUPAC Name: MP: 22 23 24 25 26 27 28 2.93 MICRONS 6 3.5 4 4.5 $ 5.5 8 9 10 11 12 13 14 15 16 17 18 19 21 23 250.0 100 90 M -.05 A % 80 พ -0.1 R 70 -0.28 А N60 S M 50 40 A N 30 с E 20 S O 0.3R B -0.4 С 10.SE -0.6 +0.7 0.8 F1.0 10 0 4500 4400 4200 4000 3800 3600 3400 3200 3000 2800 2800 2400 2200 -2.0 400 2000 1200 1000 800 600 1800 1600 1400 WAVENUMBERS OK SAVE

Identify all of the peaks in the NMR spectrum and record the chemical shift, the splitting, and the number of hydrogens for each peak in the NMR table below:

Do the FTIR and NMR spectra you measured and recorded in the tables above confirm that you synthesized the assigned target compound? Explain

Answer 1

IR absorbtions : = 3000cm 2 O C-H(SIF) of CH3 ② CH (str) of CH₂ C-O (SIE) 2900 cm (weak) C-cslr) 1200cm. = 1400 cant C-H 31 12 H CH Chemical The given compound: 3,3-dimethyl - 1,2-epoxy bulan. CH₃ the CH3 Prolons of equivalent splitting Shift 1 methylene) 3.5-4.oppm (doublet, 2H) 2 methine, H) h.0-4.5ppm ( triplet, IH) 3 (methyt) 0.9 ppm (Singlet, 9H) The target molecule IR and 'H NMR didn't match to the structure The IR has a peaks, at 3200 cm and 1620cmt are not accountable (extra peaks). Another prominent peak at 1500 cam which is extra, generally observed for ; Cace alkene. 1

The The '4 NMR spectrum didn't match to the structure of 3,3-dimethyl-1,2-epoxy bulane, are are supposed to observea a Singlet for 9 hydrogens at 0.9 ppm, but spectrum Shows clearly a doublet at 1.0 ppm. other peaks for methytene protons and methine proton should also be observed at 3.5-4.5ppm respectively, but those are absent and we see another kind & proton signals at 5.0-6.00pm. b cl 2 2. 3 3 TH_NMR Assignments: Position of equivalent chemical splitting Protons Shift 1. Che methyl 4.5-5.5 ppm (Singlet, 3H) 2 methyline Chriplet, 2H) 3 methylne 1.5-2.0 ppm Quintet,@h) 4.5-5.0ppm