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81002-21-3

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81002-21-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81002-21-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,0,0 and 2 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81002-21:
(7*8)+(6*1)+(5*0)+(4*0)+(3*2)+(2*2)+(1*1)=73
73 % 10 = 3
So 81002-21-3 is a valid CAS Registry Number.

81002-21-3Relevant articles and documents

High Asymmetric Induction in Conjugate Additions of RCu*BF3 to Chiral Enoates

Opplzer, Wolfgang,Loeher, Heinz J.

, p. 2808 - 2811 (1981)

1,4-Additions of PhCu*BF3, n-BuCu*BF3 and MeCu*BF3 to the trans-8-phenylmenthyl enoates 1 proceeded with high chiral induction.Saponification of the resulting esters 2 gave the corresponding enantiomerically pure β-substituted alkanoic acids 3 and the recovered (-)-8-phenylmenthol in good overall yields.Analogous additions to the cis-crotonate 1 led preferentially to the acids 3 enantiomeric to those obtained from the trans-crotonate 1, although with lower selectivity.A stereochemical model is proposed consistent with the observed results (Scheme 2, Table).

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