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166902-16-5

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166902-16-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 166902-16-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,6,9,0 and 2 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 166902-16:
(8*1)+(7*6)+(6*6)+(5*9)+(4*0)+(3*2)+(2*1)+(1*6)=145
145 % 10 = 5
So 166902-16-5 is a valid CAS Registry Number.

166902-16-5Relevant articles and documents

Use of thiazyl chlorides, alkyl carbamates, and thionyl chloride to fuse 1,2,5-thiadiazoles to quinones and to oxidize, chlorinate, and aminate them

Shi,Katz,Yang,Liu

, p. 1285 - 1297 (1995)

Thiazyl chlorides in a simple one-step procedure fuse 1,2,5-thiadiazole rings to quinones. So do alkyl carbamates mixed with excess thionyl chloride and pyridine. Evidence is put forward to support the hypothesis that NSCl or a related thiazyl derivative is the reactive species that brings about the transformations. Selenoyl chloride mixed with an alkyl carbamate, pyridine, and quinones similarly gives 1,2,5-selenodiazoloquinones. Thionyl chloride in pyridine chlorinates quinones and oxidizes hydroquinones. 2,3-Dichloro-1,4-quinones with S4N4 or with alkyl N-sulfinylcarbamates give 1,2,5-thiadiazoloquinones. Quinones and their 2,3-dichloro derivatives with TsNSO in pyridine give betaine derivatives of 2,3-diaminoquinones, which pyrrolidine converts into 2-amino-3-(tosylamino)quinones. A unified set of mechanisms is presented that accounts for these transformations.

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