CH_318N_Lecture6-08_Spring_08

CH_318N_Lecture6-08_Spring_08 - 1 Chemistry 318N Lecture 6...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Chemistry 318N Lecture 6 Infrared spectroscopy February 5, 2008 Chemistry 318N Oh no!!an unknown ! 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Empirical Formula C 2 H 3 O M = m/z 172 4.20 4.10 4.00 1.30 1.20 1 2 Chemistry 318N Solving nmr unknowns 1. Molecular Formula and unsaturation number: C 2 H 3 O mass = 43, 172/43 = 4 b C 8 H 12 O 4 C 8 H 18 C 8 H 12 H 6 6/2 = 3 Three rings or three pi bonds or a combo of these. Chemistry 318N Solving nmr unknowns 2. Number of distinct signals is..3, three different types of equivalent hydrogens 3. Integration: ratio is 20:40:60 = 1:2:3 1+2+3 = 6 12/6 = 2 The ratio of hydrogens is then 2:4:6 4. Pattern of Chemical Shifts: =1.2,4.2,6.7 5. Please read carefully pages 530 -532! 3 Chemistry 318N Type of H 1.6-2.6 2.0-3.0 0.9 1.2-1.4 1.4-1.7 2.1-2.3 0.5-6.0 2.2-2.6 3.3-4.0 2.2-2.5 2.3-2.8 0.5-5.0 RC CH O O RCH 2 OR (C H 3 ) 4 Si ArC H 3 RCH 3 RCCH 3 ROH ArC H 2 R RCH 2 R R 3 CH R 2 NH RCCH 2 R R 2 C=CRC HR 2 Type of H Chemical Shift - 1 H-NMR Chemistry 318N 4.6-5.0 9.5-10.1 5.0-5.7 10-13 3.5-3.9 4.1-4.7 3.1-3.33....
View Full Document

Page1 / 14

CH_318N_Lecture6-08_Spring_08 - 1 Chemistry 318N Lecture 6...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online