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74788-58-2

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74788-58-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74788-58-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,7,8 and 8 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 74788-58:
(7*7)+(6*4)+(5*7)+(4*8)+(3*8)+(2*5)+(1*8)=182
182 % 10 = 2
So 74788-58-2 is a valid CAS Registry Number.

74788-58-2Relevant articles and documents

Phosphine-Substituted Chelate Ligands, XXV. Diastereoselective Complexation of Chiral Phosphinothioformamides with Remote Asymmetric Centre

Kunze, Udo,Burghardt, Roland

, p. 860 - 866 (2007/10/02)

For further studies of the diastereoselective complex formation of ambidentate chiral chelating ligands, we prepared the racemic phosphinothioformamides, Ph2P(X)C(S)NHC*HR1R2, with X = 2e- (R1 = Ph, R2 = Et: 1a; R1 = Ph, R2 = iPr: 2a; R1 = Me, R2 = Et: 3a) and X = O (1b, 2b) according to a previously reported route.The coordination of 1a-3a to CpM(CO)3Cl (M = Mo, W) in methanol gives the diastereomeric P,S-chelate complexes, (Mo: 4-6, W :7-9).In solution, epimerisation proceeds to an equilibrium ratio of B/A = 1.5 in case of 4, 5, 7, and 8, but less than 1.1 with 6 and 9.A reduced diastereoselectivity (d.e. 10-20percent) is also observed during the formation of the analogous molybdenum complexes 10a-d with phosphine ligands derived from α-amino acid esters, Ph2PC(S)NHC*H(R)COOMe .The results indicate a significant asymmetric induction despite of the four bond distance of the chiral centres. - Diastereoselectivity, Chiral Phosphinothioformamides, Amino Acid Esters, Remote Asymmetric Centre, Cyclopentadienyl Molybdenum and Tungsten Complexes

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