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196600-21-2

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196600-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 196600-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,6,6,0 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 196600-21:
(8*1)+(7*9)+(6*6)+(5*6)+(4*0)+(3*0)+(2*2)+(1*1)=142
142 % 10 = 2
So 196600-21-2 is a valid CAS Registry Number.

196600-21-2Relevant articles and documents

Enantioselective synthesis of chromans for the preparation of enantiopure vitamin E and analogues

Tietze, Lutz F.,G?rlitzer, Jochen

, p. 877 - 885 (2007/10/03)

Coupling of the differently protected (hydroxymethyl)enynes 11 a-e and 12a-c with the iodoarene 7 in the presence of catalytic amounts of Pd(PPh3)4 afforded the arylenynes 5a-e and 6a-c which were transformed into the monoprotected chiral trihydroxy compounds 13 a-d and 14a,b by Sharpless bishydroxylation with >95% ee for 13 a-d, 91% ee for 14b, and 64% ee for 14a. A 5-step transformation of 13a led to the desired chroman derivative 3a which was cleaved to give the aldehyde 2 a known precursor for the enantioselective synthesis of vitamin E.

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