Accession Number:

ADA220867

Title:

Pyrazole Derivatives of Three-Coordinated Boranes

Descriptive Note:

Interim rept.

Corporate Author:

KENTUCKY UNIV LEXINGTON DEPT OF CHEMISTRY

Report Date:

1990-04-01

Pagination or Media Count:

21.0

Abstract:

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.

Subject Categories:

  • Inorganic Chemistry
  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE