Pyrazole Derivatives of 9-Borabicyclo(3.3.1)Nonane.

摘要

9-Dimethylamino-9-borabicyclo(3.3.1)nonane, (C8H14)BN(CH3)2 reacts with one molar equivalent of pyrazole (=Hpz) to form the complex (C8H14)B(pz).(CH3)2NH, and with additional Hpz to yield (C8H14)B(pz).Hpz. The latter complex is also obtained by the reaction of 9-borabicyclo(3.3.1)nonane dimer, (C8H14)BH)2 (=9-BBN), with Hpz. The adduct can be deprotonated to form (C8H14)B(pz)2(-), which reacts with Palladium Chloride to yield PdMU-PZ)2B(C8H14)2. This same Pd complex is obtained when (C8H14)B(pz).(CH3)2NH is reacted with Sodium Hydride and then with (CIPd (Pi-CH2CHCH2)2 in boiling benzene, whereas at room temperature the latter reaction yields the complex (PZ)Pd(Pi-CH2CHCH2)2. Reaction of (C8H14)B(Pz)2)(-) with (C1PD Pi-CH2CHCH2)2 yields the complex (C8H14)B mu-pz)2Pd(Pi-CH2CHCH2). The pyrazabole (C8dH14)B mu-pz)2B(C8H14) is obtained by the reaction of (C8H14)B(pz).Hpz with 9-BBN, the direct interaction of 9-BBN with Hpz, or the thermal decomposition of (C8H14)B(pz). (CH3)2NH in molten Hpz. A relative of this pyrazabole, i.e., (C8H14)B (mu-pz) (mu-NHCH3)B(C8H14) is obtained by the reaction of (C8H14)B(pz).CH2NH2 with 9-BBN. Keywords: Pyrazolylborates; Palladium complexes; Mu-amido-Mu-pyrazolatodiboranes. (AW)