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81422-90-4

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81422-90-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81422-90-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,4,2 and 2 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 81422-90:
(7*8)+(6*1)+(5*4)+(4*2)+(3*2)+(2*9)+(1*0)=114
114 % 10 = 4
So 81422-90-4 is a valid CAS Registry Number.

81422-90-4Relevant articles and documents

Synthesis of the spiroacetal fragments of spirofungins A and B, antibiotics isolated from Streptomyces violaceusniger Tü 4113

Sakauchi, Hiroyuki,Higashi, Emi,Shimizu, Yuko,Kojima, Mikiko,Asamitsu, Yuko,Kuwahara, Shigefumi,Izumi, Minoru,Kiyota, Hiromasa

, p. 337 - 343 (2015/12/24)

The spiroacetal [C(9)-C(20)] fragments of spirofungins A and B, antibiotics isolated from Streptomyces violaceusniger Tü 4113, were prepared from a known bromo alcohol derived from (S)-citronellal, using thermodynamically controlled iodolactonization and spiroacetalization as the key steps.

Isomer Selectivity in Stereocontrolled Payne Rearrangement-epoxide Cleavage of 2,3-Epoxy Alcohols in Aprotic Solvents: Application to an Enantioselective Total Synthesis of (+)-exo-Brevicomin

Page, Philip C. Bulman,Rayner, Christopher M.,Sutherland, Ian O.

, p. 1375 - 1382 (2007/10/02)

Organo-copper and -cuprate reagents may be used to trap the more reactive epoxy alkoxide isomer in a Lewis acid-catalysed Payne rearrangement process.This methodology has been used as the key step in a five-step enantioselective total synthesis of (+)-exo

Studies toward polyether antibiotics: stereospecific synthesis of polysubstituted tetrhydropyrans

Ho, Pak-Tsun

, p. 90 - 94 (2007/10/02)

A stereospecific and general method for the preparartion of trans-tetrahydropyrans 1 and cis-tetrahydropyrans 2 from acyclic precursors are described.Compound 12, a possible intermediate for the synthesis of antibiotic X-14547A, has been synthesized.

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