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956434-21-2

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956434-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 956434-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,6,4,3 and 4 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 956434-21:
(8*9)+(7*5)+(6*6)+(5*4)+(4*3)+(3*4)+(2*2)+(1*1)=192
192 % 10 = 2
So 956434-21-2 is a valid CAS Registry Number.

956434-21-2Relevant articles and documents

Syntheses of five- and seven-membered ring sultam derivatives by Michael addition and Baylis-Hillman reactions

Tong, Kun,Tu, Jinchang,Qi, Xueyong,Wang, Min,Wang, Yanjie,Fu, Haizhen,Pittman Jr., Charles U.,Zhou, Aihua

, p. 2369 - 2375 (2013)

Five- and seven-membered sultam derivatives were conveniently synthesized via intra- or intermolecular Michael additions and an improved vinyl sulfonamide Baylis-Hillman reaction. Two different cyclization pathways were explored for the oxa-Michael reaction. A good solvent was discovered for an otherwise sluggish ketone-type Baylis-Hillman reaction in which vinyl sulfonamide ketones were used as the precursors. Furthermore, a strong base caused vinyl sulfonamide ketones to undergo 5-endo-trig intramolecular cyclizations, which are disfavored according to Baldwin's rule. Finally Baylis-Hillman reaction products were used as scaffolds for diversity-oriented sultam syntheses.

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