455330-37-7Relevant academic research and scientific papers
Coordination of fluoro ligands toward sodium ions makes the difference: Aqua sodium ions act as Bronsted acids in polymerization of vinyl ethers and styrenes
Chang, Chi-Tsing,Chen, Chuan-Lin,Liu, Yi-Hong,Peng, Shie-Ming,Chou, Pi-Tai,Liu, Shiuh-Tzung
, p. 7590 - 7592 (2006)
In searching for aqua sodium species acting as Bronsted acids in catalysis, we explored the phenomenon that sodium tetrakis[3,5- bis(trifluoromethyl)phenyl]borate dihydrate (NaBArF 4·2H2O) evidently provides one proton sou
Control of the stereochemical impact of the lone pair in lead(II) tris(pyrazolyl)methane complexes. Improved preparation of Na{B[3,5-(CF3)2C6H3]4}
Reger,Wright,Little,Lamba,Smith
, p. 3810 - 3814 (2001)
The reaction of Pb(acac)2 with 2 equiv of [H(Et2O)2]{B[3,5- (CF3)2C6H3]4} (HBArf) in CH2Cl2 followed by addition of 2 equiv of either HC(pz)3 or HC(3,5-Me2pz)3 (pz = pyrazolyl ring) leads to the formation of {Pb[HC(pz)3]2}{B[3,5- (CF3)2C6H3] 4}2 (1) and {Pb[HC(3,5-Me2pz)3]2}{B[3,5- (CF3) 2C6H3]4}2 (2), respectively. The cation in 1 has a distorted octahedral structure with a stereochemically active lone pair on lead(II). In contrast, the cation in 2 is trigonally distorted octahedral with the lone pair on the lead(II) clearly stereochemically inactive. The driving force for this cation to have a stereochemically inactive lone pair is that in this geometric arrangement the interligand distances between adjacent 3-position methyl groups are close to 4.0 A, the sum of the van der Waals radii of two methyl groups. To facilitate this chemistry, the synthesis of Na{B[3,5-(CF3) 2C6H3]4}, needed to prepare HBArf, has been dramatically improved. The main change is to add NaBF4 to the reaction mixture before forming the Grignard from the reaction of magnesium and 3,5-(CF3)2C6H3Br. The Grignard reacts with the NaBF4 as it forms, reducing the danger of explosion and leading to a higher isolated yield of the product. Crystallographic information: 1 is triclinic, P1, a = 13.0133(6) A, b = 17.2210(7) A, c = 24.7634(11) A, α = 71.7300(10)°, β = 82.3630(10)°, γ = 70.5120(10)°, Z = 2; 2 is triclinic, P1, a = 12.756(4) A, b = 13.469(4) A, c = 17.160(5) A, α = 82.454(7)°, β = 89.904(8)°, γ = 72.995(7)°, Z = 1.
