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155795-48-5

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155795-48-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 155795-48-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,7,9 and 5 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 155795-48:
(8*1)+(7*5)+(6*5)+(5*7)+(4*9)+(3*5)+(2*4)+(1*8)=175
175 % 10 = 5
So 155795-48-5 is a valid CAS Registry Number.

155795-48-5Relevant articles and documents

Lewis acid mediated asymmetric Diels-Alder reactions of chiral 2-phosphonoacrylates

Zhu, Jia-Liang,Chen, Po-Erh,Huang, Hue-Wen

, p. 23 - 36 (2013/02/23)

2-Phosphonoacrylates containing four chiral alcohol auxiliaries were efficiently prepared and evaluated in Lewis acid mediated Diels-Alder reactions. Under the activation of SnCl4, all reactions performed in CH 2Cl2 at -65 °C exclusively afforded the endo (endo-to-carboxylate) cycloadducts with dr's ranging from 50:50 to >99:1. The best facial selectivity was obtained from the substrate bearing a (-)-phenylmenthyl group, to give adducts as (dr >99:1) or almost as (dr = 99:1) single diastereomers. Detailed strategies for the structural elucidation of the cycloadducts as well as a rationalization of the observed stereoselectivity are described.

Total synthesis of (-)-chokol A by an asymmetric domino Michael addition-Dieckmann cyclization

Groth, Ulrich,Kesenheimer, Christian,Kreye, Paul

, p. 2223 - 2226 (2007/10/03)

A convergent and asymmetric total synthesis of (-)-chokol A was accomplished in six steps starting from the α,β-unsaturated ester (E)-9 in an overall yield of 27% with an enantiomeric excess of 95%. The key step of this synthesis is the asymmetric tandem conjugate addition-Dieckmann cyclization of the higher-order cuprate 8 derived from vinyl bromide 7 with the α,β-unsaturated ester (E)-9. Georg Thieme Verlag Stuttgart.

Radical cyclizations - Synthesis of γ-lycorane

Cossy, Janine,Tresnard, Ludovic,Pardo, Domingo Gomez

, p. 1925 - 1933 (2007/10/03)

(+)-γ-Lycorane has been synthesized in ten steps from piperonylic alcohol. Two radical reactions were used successively to build the D and B rings. A formal synthesis of (+)-γ-lycorane was achieved via an optically active unsaturated aldehyde intermediate

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