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77681-08-4

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77681-08-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 77681-08-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,6,8 and 1 respectively; the second part has 2 digits, 0 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 77681-08:
(7*7)+(6*7)+(5*6)+(4*8)+(3*1)+(2*0)+(1*8)=164
164 % 10 = 4
So 77681-08-4 is a valid CAS Registry Number.

77681-08-4Relevant articles and documents

STUDIES IN POLYETHER SYNTHESIS: SPIROACETAL FORMATION BY DIRECTED BISEPOXYDE CYCLISATION

Paterson, Ian,Boddy, Ian

, p. 5301 - 5304 (1988)

The synthesis of tricyclic polyether fragments 15 and 20, which incorporate a spiroacetal subunit, using directed bisepoxyde cyclisation is described.

Synthesis of optically active 2s-, and 7s-methyl-1.6-dioxa-spiro[4.5] decane, the pheromone components of Paravespula vulgaris (L.), from S-ethyl lactate.

Hintzer,Weber,Schurig

, p. 55 - 58 (2007/10/02)

(-)-2S, 5RS-1 and (-]-7S, 5S-2 are obtained from S-ethyl lactate 4 and their absolute configuration is thus directly correlated. Accurate enantiomeric compositions of intermediates and products were measured by complexation gas chromatography on nickel-, and manganese-bis-3-heptafluorobutyryl-1R-camphorate, 3. It could be conclusively established that the syntheses proceed with a high degree of preservation of configuration.

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