Boron borates

Boron and Borates. Boron is an essential element for plant growth however, concentrations >2 mg/L are harmful to some plants. [Pg.231]

Borate reacts with curcumin [458-37-7] C2 H2qO, in the presence of a mineral acid to give a colored 1 2 bore acid curcumin complex that has been used to determine microamounts of boron. Carrninic acid [1260-17-9J, C22H2QO23, (98) and azomethine-H (99) also form a colored complex usehil for low level detection of borates. Boron compounds give a characteristic green color when burned in a flame. [Pg.200]

Epinephryl borate Boron trifluoride etherate Nimetazepam Bromine... [Pg.1617]

See also Borates Boric acid Sodium borates boron oxides, 4 246-249 boron oxides table,4 242t environmental concerns, 4 284—285 health and safety factors, 4 285-288 occurrence, 4 245—246 Boron perchlorates, 18 278 Boron phosphate, 4 242t, 283 Boron removal, from water, 14 418 Boron-stabilized carbanions, 13 660-661 Boron subhalides, 4 141 Boron suboxide, 4 242t Boron tribromide, 4 138 manufacture, 4 145—146 physical properties of, 4 139-140t, 325 reactions, 4 141 specifications, 4 147t uses of, 4 149 Boron trichloride, 4 138 manufacture, 4 145—146 physical properties of, 4 139-140t reactions, 4 141... [Pg.114]

C-nucleophile (X = active H-borate, boronate) N-nucleophile (amine, NaN3, tosyl amide, amide, lactam, imine, carbamate, urea) O-nucleophile (alcohol, acid, carbonate) S-nucleophile (PhS02Na)... [Pg.974]

Boron may be prepared by several methods, such as chemical reduction of boron compounds, electrolytic reduction in nonaqueous phase, or by thermal decomposition. Many boron compounds including boron oxides, borates, boron halides, borohydrides, and fluoroborates can be reduced to boron by a reactive metal or hydrogen at high temperatures ... [Pg.123]

Pentaborane Diborane Decaborane Sodium borate Boron trifluoride Calcium borate Boron tribromide Boron oxide Total dust Respirable fraction Sodium tetraborate Decahydrate... [Pg.1580]

Alkyl borates, boron alkyls, and boron halides have all been used to polymerize diazoalkanes. Several authors have claimed that macrozwitterions are formed56 58. ... [Pg.92]

BORATES Boron and Oxygen Borax sodium, boron, hydrogen CLEANSER, source of element BORON to improve heat resistance of CLASS... [Pg.361]

Borofluoric acid. See Fluoboric acid Borogard ZB. See Zinc borate Boron... [Pg.550]

Boron isopropoxide. See Triisopropyl borate Boron methoxide. See Trimethyl borate Boron, (N-methylmethanamine) trihydro-, (T-4)-. See Dimethylamine borane... [Pg.550]

Boron tributoxide. See Tributyl borate Boron trichloride... [Pg.552]

The modifications of boron and boron compounds are characterized by nets or chains of boron atoms bound to each other by covalent bonds. The coordination number of the boron atoms varies between 1 and 7. The nets have the form of linked icosahedra, cuboctahedra, octahedra, graphite-like planes, or linear branched boron chains. Two-electron three-center bonds in boron-cornered triangles are the rule in the lattice structure. Boron can only form ions in combination with hydrogen (BH4 ) and oxygen (BOj ). The borates (boron oxide derivatives) form covalent nets like the silicates. They are often amorphous. [Pg.121]

Compounds containing the B—O linkage, such as borates, boronates boronites, boronic anhydrides, borinic acids, and boronic acids, are characterized by intense absorption at 1380-1310 cm involving the stretching... [Pg.355]

B-O, borates, boronates, boronites, boronic 1380-1310 7.25-7.63 s B-O str, weak band when boron octet... [Pg.249]

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