- Hello I Need Help With This Question Assingment Please Address All The Parts For The Question This Is Organic Chemist 1 (128.87 KiB) Viewed 75 times
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- Hello I Need Help With This Question Assingment Please Address All The Parts For The Question This Is Organic Chemist 3 (86.81 KiB) Viewed 75 times
Common IR Stretching Frequencies TABLE 12-2 Summary of IR Stretching Frequencies Frequency (cm) Functional Group Comments 3300 alcohol amine, amide alkyne 0-H NH ECH always broad may be broad, sharp, or brond with spikes always sharp. usually strong Što 3000 alkane -C-H just below 3000 cm H alkene just above 3000 cm acid O-H very broad 2200 alkyne nitrile -C=C- -CEN just below 2200 cm just above 2200 cm 1710 (very strong) carbonyl ketones, acids about 1710 cm aldehydes about 1725 cm esters higher about 1735 cm conjugation lowers frequency amides lower about 1650 cm conjugation lowers frequency aromatic C=C about 1600 cm 1660 alkene c=c_ >C=N c=0 imine stronger than (=C amide stronger than C=C (see above) Ethers, esters, and alcohols also show C- Stretching between 1000 and 1200 cm! Common 'H NMR Chemical Shifts TABLE 13-3 Typical Values of Chemical Shifts Type of Proton Approximate 8 Type of Proton Approximate 8 0.9 alkane (-CH) methyl >c=c. 1.7 1.3 alkane (-CH-) methylene allylic CH, Ph-H aromatic 7.2 2.3 alkane (CH) 1.4 PhâCH, benzylic methine O 9-10 온 R-C-H aldehyde 2.1 -C-CH, methyl ketone O 10-12 2.5 R-COH acid -C=C-H acetylenic R-OH alcohol variable, about 2-5 3-4 RCH, X (X - halogen. O) variable, about 4-7 Ar-OH phenol -c-c-, 5-6 R-NH, variable, about 1.54 mine Note: These values are approximate, is all chemical shints are allected by neighboring substituents The numbers given here assume that alkyl groups are the only other substituents present Amore complete table of chemical shins appears in Appendix 1 Copyright 2010 Pearson Prentice Hall, Inc
12. A couple of students are trying to confirm the success of a reaction they did in organic chemistry II lab. They take an IR spectrum of the product, which is given below. 0.8 0.6 Transmitance 0.4 0.2 1000 3000 2000 Wavenumber (cm-1) NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) a. Label the peaks above (to the left) of 1500 cm in the spectrum that correspond to the functional groups in the product. (A table of common IR stretching frequencies is on the last page.). b. Based on the IR spectrum, which of the following molecules, p-cresol, 4-methyl anisole, or 4- methyl cyclohexanol, did the students make? Explain. OH OH p-cresol 4-methyl anisole 4-methyl cyclohexanol