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266694-67-1

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266694-67-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 266694-67-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,6,6,9 and 4 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 266694-67:
(8*2)+(7*6)+(6*6)+(5*6)+(4*9)+(3*4)+(2*6)+(1*7)=191
191 % 10 = 1
So 266694-67-1 is a valid CAS Registry Number.

266694-67-1Relevant articles and documents

Enantioselective syntheses of substituted γ-butyrolactones

Eliel, Ernest L.,Bai, Xu,Ohwa, Masaki

, p. 63 - 70 (2007/10/03)

The previously described chiral 2-acyloxathianes 5 (Scheme I) are used in two different enantioselective syntheses of γ-butyrolactones. In one synthesis, Grignard addition, cleavage and reduction to carbinols RR'C(OH)CH2OH is followed by tosylation, malonate homologation, lactonization, and removal of the carbomethoxy group to give optically active γ-lactones. A modification of this synthesis (Scheme I) leads to optically active α-methylene-γ-lactones. In the second synthesis, reaction of a bromomagnesium enolate with ketones 5 leads to β-hydroxyesters, which, by appropriate sequences of reduction and cleavage (Scheme II) are converted to optically active α- or β-hydroxy-γ-lactones.

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