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120040-59-7

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120040-59-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 120040-59-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,0,4 and 0 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 120040-59:
(8*1)+(7*2)+(6*0)+(5*0)+(4*4)+(3*0)+(2*5)+(1*9)=57
57 % 10 = 7
So 120040-59-7 is a valid CAS Registry Number.

120040-59-7Relevant articles and documents

General Conjugate-Addition Method for the Synthesis of Enantiomerically Pure Lignans. Total Synthesis of (-)- and (+)-Burseran, (-)-Dehydroxycubebin, (-)-Trichostin, (-)-Cubebin, (-)-5''-Methoxyhinokinin, and (-)-Hinokinin

Rehnberg, Nicola,Magnusson, Goeran

, p. 4340 - 4349 (2007/10/02)

Conjugate addition of benzylic diphenyldithioacetal anions to enantiomerically pure (-)-(2R)-and (+)-(2S)-(benzyloxy)-2,5-dihydro-4-furan (2 r and 2 s) gave complete lignan skeletons of the dibenzylbutane class.Desulfurization followed by hydrogenolysis and, when appropriate, oxidation gave the title enantiomerically pure > 99 percent ee) lignans 45 - 50 in 24 - 35 percent overall yields from 2 r and 2 s.

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