960-71-4Relevant articles and documents
Haines, R. J.,Preez, A. L. Du
, (1972)
[4-tBu-2,6-{P(O)(OiPr)2}2C6H 2SnL]+: An NHC-stabilized organotin(II) cation and related derivatives
Wagner, Michael,Zoeller, Thomas,Hiller, Wolf,Prosenc, Marc H.,Jurkschat, Klaus
, p. 9463 - 9467 (2013)
The organotin(II) salts [4-tBu-2,6-{P(O)(OiPr)2} 2C6H2SnL]X (1: X=B[3,5-(CF3) 2C6H3)]4; 2: X=BPh4) and [4-tBu-2,6-{P(O)(OiPr)2}2
Borane-protected cyanides as surrogates of h-bonded cyanides in [FeFe]-hydrogenase active site models
Manor, Brian C.,Ringenberg, Mark R.,Rauchfuss, Thomas B.
, p. 7241 - 7247 (2014)
Triarylborane Lewis acids bind [Fe2(pdt)(CO)4(CN) 2]2- [1]2- (pdt2- = 1,3-propanedithiolate) and [Fe2(adt)(CO)4(CN) 2]2- [3]2- (adt2- = 1,3-azadithiolate, HN(CH2S-)2) to give the 2:1 adducts [Fe2(xdt)(CO)4(CNBAr3) 2]2-. Attempts to prepare the 1:1 adducts [1(BAr 3)]2- (Ar = Ph, C6F5) were unsuccessful, but related 1:1 adducts were obtained using the bulky borane B(C6F4-o-C6F5)3 (BAr F3). By virtue of the N-protection by the borane, salts of [Fe2(pdt)(CO)4(CNBAr3)2] 2- sustain protonation to give hydrides that are stable (in contrast to [H1]-). The hydrides [H1(BAr3)2]- are 2.5-5 pKa units more acidic than the parent [H1]-. The adducts [1(BAr3)2]2- oxidize quasi-reversibly around -0.3 V versus Fc0/+ in contrast to ca. -0.8 V observed for the [1]2-/- couple. A simplified synthesis of [1] 2-, [3]2-, and [Fe2(pdt)(CO) 5(CN)]- ([2]-) was developed, entailing reaction of the diiron hexacarbonyl complexes with KCN in MeCN.
Lewis Acidic Boranes, Lewis Bases, and Equilibrium Constants: A Reliable Scaffold for a Quantitative Lewis Acidity/Basicity Scale
Mayer, Robert J.,Hampel, Nathalie,Ofial, Armin R.
supporting information, p. 4070 - 4080 (2021/01/29)
A quantitative Lewis acidity/basicity scale toward boron-centered Lewis acids has been developed based on a set of 90 experimental equilibrium constants for the reactions of triarylboranes with various O-, N-, S-, and P-centered Lewis bases in dichloromethane at 20 °C. Analysis with the linear free energy relationship log KB=LAB+LBB allows equilibrium constants, KB, to be calculated for any type of borane/Lewis base combination through the sum of two descriptors, one for Lewis acidity (LAB) and one for Lewis basicity (LBB). The resulting Lewis acidity/basicity scale is independent of fixed reference acids/bases and valid for various types of trivalent boron-centered Lewis acids. It is demonstrated that the newly developed Lewis acidity/basicity scale is easily extendable through linear relationships with quantum-chemically calculated or common physical–organic descriptors and known thermodynamic data (ΔH (Formula presented.)). Furthermore, this experimental platform can be utilized for the rational development of borane-catalyzed reactions.
Iodine-catalyzed synthesis of N,N'-chelate organoboron aminoquinolate
Qiu, Renhua,Yang, Tianbao,Cao, Xin,Zhang, Xing-Xing,Ou, Yifeng,Au, Chak-Tong,Yin, Shuang-Feng
supporting information, p. 12430 - 12443 (2020/11/10)
We disclose a novel method for the synthesis of fluorescent N,N'-chelate organoboron compounds in high efficiency by treatment of aminoquinolates with NaBAr4/ R'COOH in the presence of an iodine catalyst. These compounds display high air and thermal stability. A possible catalytic mechanism based on the results of control experiments has been proposed. Fluorescence quantum yield of 3b is up to 0.79 in dichloromethane.
