Optically active pyrazolylborate: synthesis, characterization and uses in enantioselective cyclopropanation reaction

Carbonyl and Olefin Adducts of Coinage Metals Supported by Poly(pyrazolyl)borate and Poly(pyrazolyl)alkane Ligands and Silver Mediated Atom Transfer Reactions

“…99 [B(camphpz) 4 ]CuCO, has been used as a catalyst in cyclopropanation chemistry. 103 In contrast to tris(pyrazolyl)borates, bis-and tetrakis(pyrazolyl)borates or poly(pyrazolyl)alkanes have not been used successfully so far in the isolation of silver or gold carbon monoxide complexes. 2 There are several poly(pyrazolyl)borato and poly(pyrazolyl)alkane complexes of tungsten and molybdenum featuring bridging carbonyl moieties between the group 6 element and either copper or gold.…”

“…[B(Pz) 4 ]CuCO is reported to be less stable than [HB(Pz) 3 ]CuCO or [HB(3,5-(Me) 2 Pz) 3 ]CuCO . [B(camphpz) 4 ]CuCO, has been used as a catalyst in cyclopropanation chemistry . In contrast to tris(pyrazolyl)borates, bis- and tetrakis(pyrazolyl)borates or poly(pyrazolyl)alkanes have not been used successfully so far in the isolation of silver or gold carbon monoxide complexes …”

Trispyrazolylborate coinage metals complexes: Structural features and catalytic transformations

“…Importantly, the polar groups incorporated provided distinct properties regarding their potential use as adhesives, preserving the structure of the initial polymer. complexes [63].…”

Synthesis and Properties of Poly(pyrazolyl)borate and Related Boron-Centered Scorpionate Ligands. Part A: Pyrazole-Based Systems

“…Optically active sodium salt of hydrotris((-)-3(5)-methyl-1phenylethylaminomethylpyrazolyl)borate, Na[HB(P1) 3 ], was prepared by Singh et al [188] starting from (-)-3(5)-methyl-1phenylethylaminomethylpyrazole. Its use in various metal-catalysed enantioselective cyclopropanation reactions of styrene and several diazoacetates gave the corresponding trans-and cis-phenylcyclopropane-1-carboxylates with moderate to reasonably good enantioselectivities [188].…”