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  • Tautomerism
  • Process by which two isomers are interconverted by the movement of an atom or a group. Enolization is a form of tautomerism. FIG
  • Tautomers
  • Constitutional isomers that interconvert by migration of an atom or group
  • Terminal alkyne
  • Alkyne of the type FIG, in which the triple bond appears at the end of the chain
  • Termination steps
  • Reactions that halt a chain reaction. In a free-radical chain reaction, termination steps consume free radicals without generating new radicals to continue the chain.
  • Terpenes
  • Compounds that can be analyzed as clusters of isoperen units. Terpenes with 10 carbons are classified as monoterpenes, those with 15 are sesquiterpenes, those with 20 are diterpenes, and those with 30 are triterpenes
  • tert-Butyl group
  • The group (CH3)3C--
  • Tertiary alkyl group
  • Structural unit of the type R3C-, in which the point of attachment is to a tertiary carbon
  • Tertiary amine
  • Amine of the type R3N with any combination of three alkyl or aryl substituents on nitrogen
  • Tertiary carbon
  • A carbon that is directly attached to three other carbons
  • Tertiary structure
  • A description of how a protein chain is folded
  • Tesla
  • SI unit for magnetic field strength
  • tetrahedral
  • A common geometry around an atom with the electron domains/groups (bonds or lone pairs) pointing toward the points of a tetrahedron with bond angles of approximately 109.5 degrees.  Commonly found with an sp3 hybridized atom, such as the carbon in methane.
  • Tetrahedral angle
  • The angle between one line directed from the center of a tetrahedron to a vertex and a second line from the center to a different vertex. This angle is 109° 28’
  • Tetrahedral intermediate
  • The key intermediate in nucleophilic acyl substitution. Formed by nucleophilic addition to the carbonyl group of a carboxylic acid derivative
  • Tetramethylsilane (TMS)
  • The molecule (CH3)4Si, used as a standard to calibrate proton and carbon-13 NMR spectra
  • Tetrapeptide
  • A compound composed of four α-amino acids connected by peptide bonds
  • Tetrasubstituted alkene
  • Alkene of the type R2C=CR2, in which there are four carbons directly bonded to the carbons of the double bond (The R groups may be the same or different)
  • Tetrose
  • A carbohydrate with four carbon atoms
  • Thermochemistry
  • The study of heat changes that accompany chemical processes
  • Thermodynamically controlled reaction
  • Reaction in which the reaction conditions permit two or more products to equilibrate, giving a predominance of the most stable product.
  • Thermoplastic polymer
  • A polymer that softens or melts when heated
  • Thermoset
  • The cross-linked product formed by heating a thermoplastic polymer
  • Thermosetting polymer
  • A polymer that solidifies (“curves”) when heated
  • Thiol
  • Compound of the type RSH or ArSH
  • Three-bond coupling
  • Synonymous with vicinal coupling LINK
  • Threo
  • Term applied to the relative configuration of two chirality centers within a molecule. The stereoisomer has like substituents on opposite sides of a Fischer projection.
  • Torsional strain
  • Decreased stability of a molecule associated with eclipsed bonds.
  • trans
  • Stereochemical prefix indication that two substituents are on opposite sides of a ring or a double bond. (Contrast with the prefix cis-)
  • Transamination
  • The transfer (usually biochemical) of an amino group from one compound to another
  • Transcription
  • Construction of a strand of mRNA complementary to a DNA template
Department of Chemistry & Chemical Biology