orgchemLecture 12

orgchemLecture 12 - Lecture 12: 1. IR 2. Synthesis of...

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Lecture 12: 1. IR 2. Synthesis of Acetylsalicylic Acid – Aspirin 3. Microwave Irradiation vs conventional heating Ester makes stronger bond or higher frequency-induction Conjugated by resonance weakens bond –lower frequency Sp2 CH can show up above 3000 (coming off of double bonds) 2250 sp3 CH N-H has peak, OH does not 1450-1500 1600-1650, aromatic stretch C-O, 1150 Check for geminal methyl’s. 2720 and 2800 – two C-H’s coming off from the carbonyl group – aldehyde aspirin – analgesic, antipyretic, ani-inflammatory Microwave Irradiation – Standard “in-home” microwaves heat food because the water molecules in food absorb and are excited by the microwave radiation Converts the radiation into heat very efficiently – “superheating” Drastically shortens reaction time due to heating efficiency http://www.organic-chemistry.org/topics/microwave-synthesis.shtm Microwaves from 10 ^ -1 to 10 ^-4 and frequency 10 ^ 10 to 10 ^12 waves/sec 2 important interactions responsible for heating effects of microwaves:
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1. dipole interaction
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orgchemLecture 12 - Lecture 12: 1. IR 2. Synthesis of...

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