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319475-24-6

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319475-24-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 319475-24-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,1,9,4,7 and 5 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 319475-24:
(8*3)+(7*1)+(6*9)+(5*4)+(4*7)+(3*5)+(2*2)+(1*4)=156
156 % 10 = 6
So 319475-24-6 is a valid CAS Registry Number.

319475-24-6Relevant articles and documents

Synthesis of butenolides recently isolated from marine microorganisms

Karlsson, Staffan,Andersson, Fredrik,Breistein, Palle,Hedenstr?m, Erik

, p. 7878 - 7881 (2007)

The syntheses and 13C NMR analyses of four diastereomeric butenolides, two of which were recently isolated from the marine microorganisms Streptomycete B 5632 and Streptoverticillium luteoverticillatum 11014 are described. The two isolated butenolides were found to be one of the two diastereomers (4S,10R*,11R*)-4,11-dihydroxy-10-methyl-dodec-2-en-1,4-olide (RRS-1 or SSS-1) and one of the two diastereomers (4S,10S*,11R*)-4,11-dihydroxy-10-methyl-dodec-2-en-1,4-olide (SRS-1 or RSS-1). An asymmetric 1,3-dipolar cycloaddition of a thiocarbonyl ylide with a dipolarophile attached to camphorsultam and a ring-opening of an enantiomerically pure vinyloxirane by lithiated dithiane served as key steps for the construction of the three stereogenic centres. Further elaborations including ring-closing metathesis and Mitsunobu inversion furnished the four diastereomeric butenolides.

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