556797-94-5 Usage
Uses
Used in Homogeneous Catalysis:
racemic-8,8'-Bis(diphenylphosphino)-3,3',4,4'-tetrahydro-4,4,4',4',6,6'-hexamethyl-2,2'-spirobi[2H-1-benzopyran], min. 95% SPANphos is used as a trans-spanning ligand in homogeneous catalytic reactions. It is particularly useful in the carbonylation of methanol to acetic acid, where it forms a complex with metal catalysts such as MCl2(SPANphos) (M = Pd, Pt) and Rh2(μ-Cl)2(CO)2(SPANphos).
Used in Coordination Chemistry:
In the field of coordination chemistry, racemic-8,8'-Bis(diphenylphosphino)-3,3',4,4'-tetrahydro-4,4,4',4',6,6'-hexamethyl-2,2'-spirobi[2H-1-benzopyran], min. 95% SPANphos is used to create square planar mono and di-metallic complexes with a unique cavity structure. This allows for the exploration of new catalytic systems and the development of novel compounds with potential applications in various industries.
Check Digit Verification of cas no
The CAS Registry Mumber 556797-94-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,6,7,9 and 7 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 556797-94:
(8*5)+(7*5)+(6*6)+(5*7)+(4*9)+(3*7)+(2*9)+(1*4)=225
225 % 10 = 5
So 556797-94-5 is a valid CAS Registry Number.
556797-94-5Relevant academic research and scientific papers
SPANphos ligands in palladium-catalyzed asymmetric fluorination
Jacquet, Olivier,Clement, Nicolas D.,Blanco, Carolina,Belmonte, Marta Martinez,Benet-Buchholz, Jordi,Van Leeuwen, Piet W. N. M.
experimental part, p. 4844 - 4852 (2012/10/18)
The synthesis of new enantiopure wide-bite-angle diphosphanes is described as well as their use in the palladium-catalyzed asymmetric fluorination of α-cyanoacetates. Enantiomeric excesses up to 93 % were obtained when Pd(OAc)2-SPANphos was use
SPANphos: A C2-symmetric trans-coordinating diphosphane ligand
Freixa, Zoraida,Beentjes, Mark S.,Batema, Guido D.,Dieleman, Cedric B.,Van Strijdonck, Gino P. F.,Reek, Joost N. H.,Kamer, Paul C. J.,Fraanje, Jan,Goubitz, Kees,Van Leeuwen, Piet W. N. M.
, p. 1284 - 1287 (2007/10/03)
Exclusively trans coordination is exhibited by SPANphos, a C2-symmetric diphosphane ligand containing a spiro center, which can be easily synthesized in three steps from cheap reagents. The crystal structures of the ligand and of the complex [P
