| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 276 | DF | BORON OR COMPOUND THEREOF {5} |
| 289 | DF | .~ Binary compound (e.g., boride, etc.) {5} |
| 294 | | .~.~ Hydrogen containing {2} |
| 295 | DF | .~.~.~> By reacting metal hydride or organic derivative thereof |
| 296 | DF | .~.~.~> By reacting free hydrogen |