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281193-45-1

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281193-45-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 281193-45-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,1,1,9 and 3 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 281193-45:
(8*2)+(7*8)+(6*1)+(5*1)+(4*9)+(3*3)+(2*4)+(1*5)=141
141 % 10 = 1
So 281193-45-1 is a valid CAS Registry Number.

281193-45-1Downstream Products

281193-45-1Relevant articles and documents

Stereoselective synthesis of trifluoro- and monofluoro-analogues of frontalin and evaluation of their biological activity

Ambrosi,Arnone,Bravo,Bruche,De Cristofaro,Francardi,Frigerio,Gatti,Germinara,Panzeri,Pennacchio,Pesenti,Rotundo,Roversi,Salvadori,Viani,Zanda

, p. 8336 - 8343 (2007/10/03)

The stereoselective synthesis of both enantiomers of trifluoro frontalin (-)-(1S,5R)- and (+)-(1R,5S)-8, as well as of diastereomeric monofluoro frontalines (-)- (1R,2R,5R)-18 and (-)-(1R,2S,5R)-20, analogues of the bioactive component of the aggregation pheromone of the Scolytidae insect family, has been accomplished starting from (-)-(1R)- and (+)-(1S)-menthyl (S)-toluene-4-sulfinate as a source of chirality and methyl trifluoroacetate or fluoroacetate, respectively, as sources of fluorine. The C-1 stereocenters were installed via stereoselective epoxidation of β-sulfinyl ketones 2 and 13 with diazomethane. The bicyclic core was obtained by totally stereocontrolled and chemoselective tandem Wacker oxidation/intramolecular ketalization of the intermediate unsatured sulfinyl diols 5, 15, and 19. Axially fluorinated (-)-20 elicited a strong electroantennographic response in laboratory tests on females of Dendroctonus micans, whereas equatorially fluorinated (-)-18 and the trifluoroanalogue (-)-8 showed modest responses. Field trials using (-)-20 were not indicative owing to the locally scarce population of D. micans, but it showed some attractiveness for other Coleoptera families.

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