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40058-13-7

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40058-13-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40058-13-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,0,5 and 8 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 40058-13:
(7*4)+(6*0)+(5*0)+(4*5)+(3*8)+(2*1)+(1*3)=77
77 % 10 = 7
So 40058-13-7 is a valid CAS Registry Number.

40058-13-7Relevant articles and documents

Stereochemistry of Substitution at Trico-ordinate Phosphorus

Nielsen, John,Dahl, Otto

, p. 553 - 558 (2007/10/02)

A series of reactions of ring-substituted 1,3,2-dioxaphospholanes, 1,3,2-oxazaphospholanes, 1,2-oxaphospholes, and phosphetanes bearing the leaving groups Cl, OR, or NR2 on phosphorus, with the nucleophiles HCl, MeO-, MeOH, PhOH, Me2NH, Et2NH, and 5NH have been studied.N.m.r. signals (1H and 31P) from reactant and product diastereoisomers have been assigned, and the stereochemistry of the substitution reactions have been determined by 31P n.m.r. monitoring.The outcome varies from complete inversion to complete lack of stereoselectivity.During the initial stages many of the non-selective reactions proceed with predominant inversion, and most of the results may be interpreted by assuming that the actual substitution step occurs with inversion, and that the lack of stereoselectivity is due to competing isomerizations of products or reactants.Exceptions are certain reactions where the leaving group is Cl; these appear to involve a non-selective substitution step.

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