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28797-03-7

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28797-03-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28797-03-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,7,9 and 7 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 28797-03:
(7*2)+(6*8)+(5*7)+(4*9)+(3*7)+(2*0)+(1*3)=157
157 % 10 = 7
So 28797-03-7 is a valid CAS Registry Number.

28797-03-7Relevant articles and documents

Ketone methylenation using the Tebbe and Wittig reagents - A comparison

Pine,Shen,Hoang

, p. 165 - 167 (1991)

Ketone methylenation has been accomplished using the Tebbe and the Wittig reagents. Comparison of the two reagents for a variety of ketones shows that the Tebbe reagent gives better product yields than the Wittig reagent. This is particularly important when the ketone substrate is hindered. It is also noted that the Tebbe reaction accomplishes methylenation in a non-basic medium, thus racemization does not take place on substrates with enolizable chiral centers.

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