Definitions Conjugated double bonds are separated by one single bond. Example: 1, 3-pentadiene. Isolated double bonds are separated by two or more single bonds. 1, 4-pentadiene. Cumulated double bonds are on adjacent carbons. Example: 1, 2-pentadiene

Introduction Formula R-O-R where R is alkyl or aryl. Symmetrical or unsymmetrical Examples:

Introduction NMR is the most powerful tool available for organic structure determination. It is used to study a wide variety of nuclei:

Spectroscopy is an analytical technique which helps determine structure. It destroys little or no sample. The amount of light absorbed by the sample is measured as wavelength is varied

Types of Alcohol Reactions HH H Dehydration to alkene ·xidation to aldehyde, ketone Substitution to form alkyl halide Reduction to alkane ·Esterification ·Tosylation Williamson synthesis of ether

Classification Primary: carbon with -OH is bonded to one other carbon. Secondary: carbon with-OH is bonded to two other carbons. · Tertiary: carbon with-OH is bonded to three other carbons. Aromatic(phenol): -OH is bonded to a benzene ring

Introduction Alkynes contain a triple bond. General formula is C.H2n-2 Two elements of unsaturation for each triple bond. · Some reactions are like alkenes: addition and oxidation. · Some reactions are specific to alkynes

Reactivity of C=C C—C Electrons in pi bond are loosely held Electrophiles are attracted to the pi electrons. · Carbocation intermediate forms. Nucleophile adds to the carbocation. · Net result is addition to the double bond

Functional Group Pi bond is the functional group. · More reactive than sigma bond. · Bond dissociation energies:

Classes of Halides Alkyl: Halogen, X, is directly bonded to sp3 carbon. Vinyl: X is bonded to sp2 carbon of alkene. Aryl: is bonded to sp2 carbon on benzene ring. Examples: