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406949-67-5

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406949-67-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 406949-67-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,6,9,4 and 9 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 406949-67:
(8*4)+(7*0)+(6*6)+(5*9)+(4*4)+(3*9)+(2*6)+(1*7)=175
175 % 10 = 5
So 406949-67-5 is a valid CAS Registry Number.

406949-67-5Relevant articles and documents

Asymmetric synthesis of 4,4-disubstituted 2-cyclopentenones from optically active 1-chlorovinyl p-tolyl sulfoxides and cyanomethyllithium with formation of a quaternary chiral center

Satoh, Tsuyoshi,Yoshida, Masaaki,Ota, Hiroyuki

, p. 9241 - 9244 (2001)

Treatment of optically active 1-chlorovinyl p-tolyl sulfoxides having two different substituents at the 2-position, which were synthesized from unsymmetrical ketones and (R)-(-)-chloromethyl p-tolyl sulfoxide in three steps, with cyanomethyllithium gave optically active 2-amino-1-cyano-5,5-disubstituted-1,3-cyclopentadienes with very high asymmetric induction from the sulfoxide chiral center. The products were converted to the enantiomerically pure 4,4-disubstituted 2-cyclopentenones by heating with phosphoric acid in acetic acid.

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