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1236055-60-9

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1236055-60-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1236055-60-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,3,6,0,5 and 5 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1236055-60:
(9*1)+(8*2)+(7*3)+(6*6)+(5*0)+(4*5)+(3*5)+(2*6)+(1*0)=129
129 % 10 = 9
So 1236055-60-9 is a valid CAS Registry Number.

1236055-60-9Downstream Products

1236055-60-9Relevant articles and documents

Synthesis of the QRSTU domain of maitotoxin and its 85- epi - And 86- epi -diastereoisomers

Nicolaou,Gelin, Christine F.,Seo, Jae Hong,Huang, Zhihong,Umezawa, Taiki

supporting information; experimental part, p. 9900 - 9907 (2010/09/03)

A devised synthetic strategy toward the QRSTU ring system 4 of the marine-derived biotoxin maitotoxin (1) delivered, in addition to 4, its diastereoisomers 85-epi-QRSTU and 86-epi-QRSTU ring systems 5 and 6. The convergent route to these maitotoxin fragments involved coupling of UT and Q building blocks 9 (obtained from 2-deoxy-d-ribose) and 10 (obtained from d-ribose) followed by ring-closing metathesis to afford enol ether 8, whose elaboration to the targeted QRSTU ring system 4 required its conversion to hydroxy ketone 7. The latter compound (7) was transformed to the final product through a hydroxy dithioketal cyclization, followed by oxidation/methylation of the resulting O,S-mixed ketal to install the last of the five methyl groups contained within the target molecule (4). 13C NMR spectroscopic analysis of synthesized fragments 4, 5, and 6 and comparisons with maitotoxin provided strong support for the originally assigned structure of the QRSTU domain of the natural product.

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