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139748-06-4

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139748-06-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139748-06-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,7,4 and 8 respectively; the second part has 2 digits, 0 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 139748-06:
(8*1)+(7*3)+(6*9)+(5*7)+(4*4)+(3*8)+(2*0)+(1*6)=164
164 % 10 = 4
So 139748-06-4 is a valid CAS Registry Number.

139748-06-4Relevant articles and documents

β-Lactam antifungals. II. Enantiocontrolled synthesis of (2R,5S)-2-hydroxymethyl-1-carbapenam, the carba-analog of a clavam antifungal

Konosu,Furukawa,Hata,Oida

, p. 2813 - 2818 (2007/10/02)

(2R,5S)-2-Hydroxymethyl-1-carbapenam (3), the carba-analog of an antifungal β-lactam (2R,5S)-2-(hydroxymethyl)clavam (1), was synthesized in an enantiocontrolled manner, starting from the coupling reaction of an optically active phthalimido-acetate (3S,4S)-4 and an allylsilane 7, followed by removal of the phthalimido group that was crucial for asymmetric induction. Hydroboration, protecting-group interconversion, and cyclization gave 3 stereoselectively.

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