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164201-44-9

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164201-44-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 164201-44-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,4,2,0 and 1 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 164201-44:
(8*1)+(7*6)+(6*4)+(5*2)+(4*0)+(3*1)+(2*4)+(1*4)=99
99 % 10 = 9
So 164201-44-9 is a valid CAS Registry Number.

164201-44-9Upstream product

164201-44-9Relevant articles and documents

Synthesis of 3-hydroxycephems from penicillin G through cyclization of chlorinated 4-(phenylsulfonylthio)-2-azetidinones promoted by a BiCl3/Sn or TiCl4/Sn bimetal redox system

Tanaka,Taniguchi,Kameyama,Monnin,Torii,Sasaoka,Shiroi,Nagao,Yamada,Tokumaru

, p. 1385 - 1391 (2007/10/02)

A novel access to 3-hydroxycephems was attained from penicillin G via the C=C bond cleavage of 1-(1-alkoxycarbonyl-2-chloromethyl-2-propenyl)-4-(phenylsulfonylthio)- 2-azetidinones by successive treatment with RuCl3/HIO4 and HIO4/CuSO4 and reductive cyclization of I-(I-alkoxycarbonyl-3-chloro-2-hydroxy-1-propenyl)-4-(phenylsulfonylth io)-2-azetidinones on treatment with a newly devised BiCl3/Sn or TiCl4/Sn bimetal redox couple in DMF containing pyridine.

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