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178628-92-7

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178628-92-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 178628-92-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,8,6,2 and 8 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 178628-92:
(8*1)+(7*7)+(6*8)+(5*6)+(4*2)+(3*8)+(2*9)+(1*2)=187
187 % 10 = 7
So 178628-92-7 is a valid CAS Registry Number.

178628-92-7Downstream Products

178628-92-7Relevant articles and documents

Direct chemical synthesis of β-mannopyranosides and other glycosides via glycosyl triflates

Crich, David,Sun, Sanxing

, p. 8321 - 8348 (2007/10/03)

High yield, highly stereoselective methods for the synthesis of β- mannopyranosides primary, secondary, and tertiary alcohols are presented. Activation of mannosyl sulfoxides or mannosyl thioglycosides with trifluoromethanesulfonic anhydride or benzenesulfenyl triflate, respectively, leads to the efficient formation of α-mannosyl triflates at -78 °C in dichloromethane, in the presence of 2,6-di-tertbutyl-4-methylpyridine. These triflates then react S(N)2-like with alcohols to give the β-mannosides. The use of a 4,6-O-benzylidene protected mannose is required for high selectivity, as is the use of non-participating protecting groups on O-2 and O-3 of the donors. It is further demonstrated that the thioglycoside/benzensulfenyl triflate activation is applicable in the glucoside series, when both armed and disarmed protecting groups are tolerated.

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