Nomenclature
CAS number: 17194-00-2
Barium hydroxide (Ba(OH)
2); barium dihydroxide; activated barium hydroxide; caustic baryta.
BaH
2O
2; mol wt 171.34.
Ba 80.15%, H 1.18%, O 18.68%.
Ba(OH)
2.
Description and references
Reacts as base/nucleophile in organic syntheses.
Prepn: Gmelins, Barium (8th
ed) 30, 106-111 and suppl. 175-177, 289 (1960). Thermal
dehydration and decomposition study: G. M. Habashy, G. A. Kolta, J. Inorg. Nucl. Chem. 34, 57
(1972). Use as a catalyst in organic synthesis: J. Barrios et al., J. Catal. 112, 528 (1988); I. Paterson et al., Synlett 1993, 774; Y.-D. Gong et al., J. Org. Chem. 63, 4854 (1998); R. S. Varma et al., Tetrahedron Lett. 39, 8437 (1998).
Review of synthetic applications: S. Jeanmart, Synlett 2002, 1739-1740. Review of toxicology
and human exposure: Toxicological Profile
for Barium and Compounds (PB93-110658, 1992) 163 pp.
Derivative
Monohydrate.
Nomenclature
CAS number: 22326-55-2
Dried barium hydroxide.
BaH
2O
2.H
2O; mol wt 189.36.
Ba 72.52%, H 2.13%, O 25.35%.
Properties
Obtained by heating commercial Ba(OH)2.8H2O at 200°. White powder. Poisonous. d 3.743. Slightly sol in water; sol in dil acids.Derivative
Octahydrate.
Nomenclature
CAS number: 12230-71-6
BaH
2O
2.8H
2O; mol wt 315.46.
Ba 43.53%, H 5.75%, O 50.72%.
Properties
Most common form of the hydroxide, readily available
commerically. Transparent crystals or white masses. Very alkaline;
rapidly absorbs CO2 from air, becoming incompletely sol
in water. Poisonous. mp 78°. Freely sol in water, methanol;
slightly sol in ethanol. Practically insol in acetone. Keep tightly closed.Use
In manuf of alkali, glass; in synthetic rubber vulcanization,
in corrosion inhibitors, pesticides, sugar industry; boiler scale
remedy; refining animal and vegetable oils; softening water. Catalyst
in organic synthesis. Carbonate-free base in alkalimetry.