Pyrazole Derivatives of Three-Coordinated Boranes
KENTUCKY UNIV LEXINGTON DEPT OF CHEMISTRY
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The application of the poly1-pyrazolylborate ions, RnBpz4-n-R noncoordinating substituent, Hpz pyrazole or C-substituted derivatives thereof, n0, 1, 2, as polydentate ligands in coordination chemistry has resulted in a concentration of efforts in this area. Thus, principal aspects of the interaction of pyrazoles with boranes have hardly been explored. For example, although various poly1-pyrazolylborates have been described, only two such compounds are known where at least one of the boron substituents R is not a pz group but does contain a coordinating site and, thus, can act as hybrid ligand. On the other hand, such hybrid species should be available by simple complexation of pyrazole with a trigonal boron compound that contains a substituent with a donor site. The resultant species may also be formulated or can react as species containing an acidic hydrogen, e.g., HpzBRRR. Only a few such acids have been described, and it has been established that pz3BNCH32 does indeed act as a multidentate hybrid ligand. Interestingly, only one example of a mono1-pyrazolylborate ion, i.e., pzBH3-with Hpz 3,5- dimethylpyrazole, is known so far. The present work is concerned with a fundamental study of the interaction between pyrazole and trigonal boranes under various conditions, in order to explore the formation and general chemistry of such adducts. Keywords Pyrazaboles Pyrazolylborates Pyrazole boranes.
- Inorganic Chemistry
- Organic Chemistry