Pyrazole Derivatives of Three-Coordinated Boranes
Abstract
The application of the poly(1-pyrazolyl)borate ions, RnB(pz)4-n-(R = noncoordinating substituent, Hpz = pyrazole or C-substituted derivatives thereof, n=0, 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 poly(1-pyrazolyl)borates 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., H(pz)BRR'R'. Only a few such acids have been described, and it has been established that ((pz3BN(CH3)2) does indeed act as a multidentate hybrid ligand. Interestingly, only one example of a mono(1-pyrazolyl)borate ion, i.e., (pz)BH3-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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1990
- Accession Number
- ADA220867
Entities
People
- A. Meller
- J. Serwatowski
- Kurt S. Niedenzu
- L. Komorowski
- W. Maringgele
Organizations
- University of Kentucky