those of coriander, cumin, lemon,
and samphire. It can be made by the
action of an alcoholic sulphuric acid
solution on pinene (the major component of turpentine).
tertiary alcohol See alcohols.
tertiary amine See amines.
tervalent (trivalent) Having a valency of three.
Terylene Tradename for a type of
*polyester used in synthetic Übres.
tesla Symbol T. The SI unit of magnetic Ûux density equal to one weber
of magnetic Ûux per square metre,
i.e. 1 T = 1 Wb m
–2 . It is named after
Nikola Tesla (1870–1943), Croatianborn US electrical engineer.
tetrachloroethene A colourless
nonÛammable volatile liquid,
CCl 2 :CCl 2 ; r.d. 1.6; m.p. –22°C; b.p.
121°C. It is used as a solvent.
tetrachloromethane (carbon
tetrachloride) A colourless volatile
liquid with a characteristic odour,
virtually insoluble in water but miscible with many organic liquids, such
as ethanol and benzene; r.d. 1.586;
m.p. –23°C; b.p. 76.54°C. It is made
by the chlorination of methane (previously by chlorination of carbon
disulphide). The compound is a good
solvent for waxes, lacquers, and rubbers and the main industrial use is as
a solvent, but safer substances (e.g.
1,1,1-trichloroethane) are increasingly being used. Moist carbon tetrachloride is partly decomposed to
phosgene and hydrogen chloride and
this provides a further restriction on
its use.
tetradecanoic acid (myristic acid)
A saturated carboxylic acid CH 3
(CH 2 ) 12 COOH; r.d. 0.86; m.p. 58.8°C;
b.p. 250.5°C (100 mmHg). Its glycerides are found in nutmeg, palm oil,
and butter fat. Compounds are used
in cosmetics and skin-care preparations. The name comes from the
Latin name for nutmeg, Myristica fragrans.
tetraethyl lead See lead(iv)
tetraethyl.
tetragonal See crystal system.
tetrahedral angle The angle between the bonds in a *tetrahedral
compound (approximately 109° for a
regular tetrahedron).
tetrahedral compound A compound in which four atoms or groups
situated at the corners of a tetrahedron are linked (by covalent or coordinate bonds) to an atom at the
centre of the tetrahedron. See also
complex.
tetrahedron A polyhedron with
four triangular faces. In a regular
tetrahedron all four triangles are congruent equilateral triangles. It constitutes a regular triangular pyramid.
tetrahydrate A crystalline hydrate
containing four moles of water per
mole of compound.
tetrahydrocannabinol (THC) The
main *cannabinoid found in the
plant Cannabis sativa, and the compound largely responsible for its psychoactive effects. There have been
reports that use of THC has been
linked to the onset of psychotic
episodes in both healthy users and,
in particular, in schizophrenics. It
tertiary alcohol
522
t
O
(CH 2 ) 4 CH 3
C
H 3
C
H 3
CH 3
H
H
OH
Tetrahydrocannabinol
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and samphire. It can be made by the
action of an alcoholic sulphuric acid
solution on pinene (the major component of turpentine).
tertiary alcohol See alcohols.
tertiary amine See amines.
tervalent (trivalent) Having a valency of three.
Terylene Tradename for a type of
*polyester used in synthetic Übres.
tesla Symbol T. The SI unit of magnetic Ûux density equal to one weber
of magnetic Ûux per square metre,
i.e. 1 T = 1 Wb m
–2 . It is named after
Nikola Tesla (1870–1943), Croatianborn US electrical engineer.
tetrachloroethene A colourless
nonÛammable volatile liquid,
CCl 2 :CCl 2 ; r.d. 1.6; m.p. –22°C; b.p.
121°C. It is used as a solvent.
tetrachloromethane (carbon
tetrachloride) A colourless volatile
liquid with a characteristic odour,
virtually insoluble in water but miscible with many organic liquids, such
as ethanol and benzene; r.d. 1.586;
m.p. –23°C; b.p. 76.54°C. It is made
by the chlorination of methane (previously by chlorination of carbon
disulphide). The compound is a good
solvent for waxes, lacquers, and rubbers and the main industrial use is as
a solvent, but safer substances (e.g.
1,1,1-trichloroethane) are increasingly being used. Moist carbon tetrachloride is partly decomposed to
phosgene and hydrogen chloride and
this provides a further restriction on
its use.
tetradecanoic acid (myristic acid)
A saturated carboxylic acid CH 3
(CH 2 ) 12 COOH; r.d. 0.86; m.p. 58.8°C;
b.p. 250.5°C (100 mmHg). Its glycerides are found in nutmeg, palm oil,
and butter fat. Compounds are used
in cosmetics and skin-care preparations. The name comes from the
Latin name for nutmeg, Myristica fragrans.
tetraethyl lead See lead(iv)
tetraethyl.
tetragonal See crystal system.
tetrahedral angle The angle between the bonds in a *tetrahedral
compound (approximately 109° for a
regular tetrahedron).
tetrahedral compound A compound in which four atoms or groups
situated at the corners of a tetrahedron are linked (by covalent or coordinate bonds) to an atom at the
centre of the tetrahedron. See also
complex.
tetrahedron A polyhedron with
four triangular faces. In a regular
tetrahedron all four triangles are congruent equilateral triangles. It constitutes a regular triangular pyramid.
tetrahydrate A crystalline hydrate
containing four moles of water per
mole of compound.
tetrahydrocannabinol (THC) The
main *cannabinoid found in the
plant Cannabis sativa, and the compound largely responsible for its psychoactive effects. There have been
reports that use of THC has been
linked to the onset of psychotic
episodes in both healthy users and,
in particular, in schizophrenics. It
tertiary alcohol
522
t
O
(CH 2 ) 4 CH 3
C
H 3
C
H 3
CH 3
H
H
OH
Tetrahydrocannabinol
www.AzShimi.ir www.AzShimi.com