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  • Icosanoids
  • A group of naturally occurring compounds derived from unsaturated C20 carboxylic acids
  • Imide
  • A compound containing the group FIG
  • Imine
  • Compound of the type FIG formed by the reaction of an aldehyde or a ketone with a primary amine (R’NH2). Imines are sometime called Schiff’s bases. LINK
  • Index of hydrogen deficiency
  • A measure of the total double bonds and rings a molecule contains. It is determined by comparing the molecular formula CnHx of the compound to that of an alkane that has the same number of carbons according to the equation. FIG/equ
  • Induced
  • dipole/induced-dipole attractive force- Force of attraction resulting from a mutual and complementary polarization of one molecule by another. Also referred to as London forces or dispersion forces. LINK
  • Inductive effect
  • An electronic effect transmitted by successive polarization of the σ bonds within a molecule or an ion.
  • Infrared (IR) spectroscopy
  • Analytical technique based on energy absorbed by a molecule as it vibrates by stretching and bending bonds. Infrared spectroscopy is useful for analyzing the functional groups in a molecule.
  • Initiation step
  • A process which causes a reaction, usually a free-radical reaction, to begin but which by itself is not the principal source of products. The initiation step in the halogenations of an alkane is the dissociation of a halogen molecule to two halogen atoms.
  • Integrated area
  • The relative area of a signal in an NMR spectrum. Areas are proportional to the number of equivalent protons responsible for the peak.
  • Intermediate
  • Transient species formed during a chemical reaction. Typically, an intermediate is not stable under the conditions of its formation and proceeds further to form the product. Unlike a transition state, which corresponds to a maximum along a potential energy surface, an intermediate lies at a potential energy minimum.
  • Intermolecular attractive forces
  • Forces, either attractive or repulsive, between two atoms or groups in separate molecules.
  • Intramolecular forces
  • forces, either attractive or repulsive, between two atoms or groups within the same molecule.
  • Inversion of configuration
  • Reversal of the tree-dimensional arrangement of the four bonds to sp3-hybridized carbon. The representation shown illustrates inversion of configuration in a nucleophilic substitution where LG is the leaving group and Nu is the nucleophile. FIG
  • Ion
  • A charged particle
  • Ionic bond
  • Chemical bond between oppositely charged particles that results from the electrostatic attraction between them
  • Ionization energy
  • Amount of energy required to remove an electron from some species.
  • Isobutyl group
  • The group FIG
  • Isoelectric point
  • pH at which the concentration of the zwitterionic form of an amino acid is a maximum. At a pH below the isoelectric point the dominant species is a cation. At higher pH, an anion predominates. At the isoelectric point the amino acid has no net charge.
  • Isoionic point
  • Synonymous with isoelectric point. Link
  • Isolated Diene
  • Diene of the type FIG in which the two double bonds are separated by one or more sp3-hybridized carbons. Isolated dienes are slightly less stable than isomeric conjugated dienes.
  • Isomer
  • Different compounds that have the same molecular formula isomer may be either constitutional isomers or stereoisomers.
  • Isopentane
  • The common name for 2-methylbutane, (CH3)2CHCH2CH3
  • Isoprene rule
  • Terpenes are composed of repeating head-to-tail-linked isoprene units
  • Isoprene unit
  • The characteristic five-carbon structural unit found in terpenes FIG
  • Isopropenyl group
  • The group FIG
  • Isopropyl group
  • The group FIG
  • Isotactic polymer
  • A stereoregular polymer in which the substituent at each successive chirality center is on the same side of the zigzag carbon chain.
  • Isotope effect
  • The difference in property, usually reaction rate, that is evident when isotopes of the same atom are compared.
  • Isotopic Cluster
  • In mass spectrometry, a group of peaks that differ in m/z because they incorporate different isotopes of their component elements.
  • IUPAC rules
  • The most widely used method of naming organic compounds. It uses a set of rules proposed and periodically revised by the International Union of Pure and Applied Chemistry.
Department of Chemistry & Chemical Biology