Question

A suggested approach to solving structures is provided for your benefit (this is by no means comprehensive) Since the molecular formula is provided for each problem students will use the formula provided below where C = #carbons, N = # of nitrogen's, H = #hydrogens, and X = # of halogens to find the Unsaturation index (U). U /2C+N Examine the IR spectrum for the presence or absence of groups with diagnostic absorption bands e.g. carbonyl groups, hydroxyl groups, amines or amides, alkynes, nitriles, etc. Examine the mass spectrum for typical fragments e.g. phCHz, CH,CO-, CH3, etc. Examine the H spectrum for CH- groups, CH:CHz-groups, aromatic protons, etc. Examine the C to determine the number of carbons in different environments and the number of quaternary carbons, methane carbons, methylene carbons, and methyl carbons. Be sure to fully annotate all spectra. • Fit or assemble all the structural elements, there may be more than one way to fit these pieces and then return to each spectrum (IR, MS, "C NMR, "H NMR) to rationalize the proposed structure. Ensure that no spectral features are inconsistent with your proposed structure.

Answer 1

Aus: The Giren Molecular formula is Gg HqN Onsaturation Index(u) = $2€ +N+ 2+ H-*} 8 2C + N + 2- H-X tras 2 . So the estimated Gompound is > • IR Stretching frequency: • IR Stretching frequency comes a 3100-3200 cm & two brsaw peak comes. .. bona - This is for -N- Hu Stretching frequens, • IR Stretching frequency comes 3295 cn'f strony pear. . - Thin is for alkyne c-H bond Stretching • IR Stretching frequency comer ~ 2830 - 29 50 cmlis . This is for alkame e-H bond Stretching : • IR Stretching freueny comes. 2114 an f wear peak. This is for c = c Stretching frequemy : • HNMR specka: 1 Be NMR : 8.41 8~85 Shar 119 CiH, singlet) SH~2:1 (24, Triplet) Shenis (2H, Pentet) SHd ~.2.6(2H, Triplet She ~ 13 (24, singlet) excharyable with Dao . HAN Ĉ I Grzein bna. 623.5 Agor'n, for DEPT-1359;... - CH₂ Peares Comer are et peak come the - Ċ ce rearternary com not Comea