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244056-15-3

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244056-15-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 244056-15-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,4,0,5 and 6 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 244056-15:
(8*2)+(7*4)+(6*4)+(5*0)+(4*5)+(3*6)+(2*1)+(1*5)=113
113 % 10 = 3
So 244056-15-3 is a valid CAS Registry Number.

244056-15-3Relevant articles and documents

Neighbouring-group influence on the ring opening of 2-aryloxymethyl-1,1,2-tribromocyclopropanes under phase-transfer conditions

Bakstad, Einar,Olsen, Are S.,Sandberg, Marcel,Sydnes, Leiv K.

, p. 465 - 472 (2007/10/03)

When a number of 2-aryloxymethyl-1,1,2-tribromocyclopropanes were treated with sodium hydroxide and ethanol under phase-transfer conditions, ring opening occurred to give mixtures of acetylenic diethyl acetals and ketals in better than 80% total isolated yield. The acetylenic diethyl ketals predominated significantly and were, in some cases, almost the exclusive product. It is argued that this ketal selectivity is in part caused by hydrogen bonding between ethanol and the aryloxy group.

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