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2202-63-3

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2202-63-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2202-63-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,0 and 2 respectively; the second part has 2 digits, 6 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 2202-63:
(6*2)+(5*2)+(4*0)+(3*2)+(2*6)+(1*3)=43
43 % 10 = 3
So 2202-63-3 is a valid CAS Registry Number.

2202-63-3Relevant articles and documents

Chiral (β-Aminoalkyl)phosphines. Highly Efficient Phosphine Ligands for Catalytic Asymmetric Grignard Cross-Coupling

Hayashi, Tamio,Konishi, Mitsuo,Fukushima, Motoo,Kanehira, Koichi,Hioki, Takeshi,Kumada, Makoto

, p. 2195 - 2202 (2007/10/02)

New chiral (β-aminoalkyl)phosphines, RCH(NMe2)CH2PPh2 , were prepared by starting with optically active amino acids.The phosphines were used as ligands for nickel-catalyzed asymmetric cross-coupling of 1-arylethyl Grignard reagents (ArMeCHMgCl) with vinyl bromide.Coupling products of over 70percent enantiomeric excess (ee) were obtained in the reaction with the ligand Phephos, Valphos, Ilephos, PhGlyphos, ChGlyphos, or t-Leuphos.A mechanism involving complexation of the magnesium atom in the Grignard reagent with the amino group on the (β-aminoalkyl)phosphine ligand is proposed to account for the high stereoselectivity.The asymmetric cross-coupling was applied to the synthesis of optically active 2-arylpropionic acids.

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