CHEM 35 Lecture Notes - Lecture 1: Ketone, Racemic Mixture, Bromine

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Infrared spectroscopy: purpose = finding functional groups, how it works b. i. Absorbs 1-10 kcalmol (not enough to break bond b. iii. 10^12 to 10^14 times per sec d. ii. use 1-10 kcal/mole and e= hv. Ir spectra: mid-infrared region (4000-600 1/cm) b. transmittance and absorption are inversely related, frequency and intensity of peaks (in order of priority, stretching needs higher e than bending a. i. Higher e, higher v, higher wave number: higher bond order/strength of bond = higher e b. i. Think of single vs double vs triple bond: higher mass = lower wave number, the greater the electronegativity difference = the more intense the peak, examples: which has higher wave #? e. i. C triple bond c needs higher e e. ii. Less mass so c-h: functional group identification, h-bonding will broaden area of group a. i. Et3n (to replace oh with ots for good. Lg) and then kotbu and heat: counting gauche interactions g. i.