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Questions related from Abdualrahman Mohammed Abdualkader
I need a small amount of 4-aldehyde-3-phenylsydnone or 4-aldehyde-3-(4-methoxyphenyl)sydnone. Any suggestion for a supplier.
06 June 2015 7,371 0 View
Is there anyone who tried to prepare 4-acetyl-3-phenyl sydnone using 1,3-Dibromo-5,5-dimethylhydantoin (DBH) as a catalyst as described by Azarifar et al, 2007. I have tried it on various 3-phenyl...
01 January 2015 8,151 14 View
If both dependent and independent variables are categorical, do I have to check for confounding? And what test should I use to find the confounding variables using SPSS?
05 May 2014 6,005 10 View
For further information please see the attached figure.
04 April 2014 6,737 3 View
Drug Discovery and Development Natural products Nutraceutical and Cosmeceutical Veterinary Pharmaceuticals Pre-clinical and Clinical Studies Supply chain Waste Management Marketing &...
12 December 2013 9,160 0 View
What is the best method to convert chloroactic acid (ClCH2COOH) into chloroacetic anhydride (ClCH2CO-O-CO-CH2Cl)?
12 December 2013 3,978 2 View
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11 November 2013 553 5 View
What is the minimum purity of an isolated/synthesized compound to get a reliable IR/NMR/MS spectra?
10 October 2013 4,300 12 View
What species of candida give white colonies on ChromAgar candida?
10 October 2013 5,335 8 View
When running the Legacy Dialogs for two independent samples using SPSS, there are many tests like Mann-Whitney U test, Moses extreme reactions and Wald-Wolfowitz runs. What is the difference...
06 June 2013 5,786 5 View
Can we start from 4-chloroaniline?
05 May 2013 7,640 4 View
ISI and Scopus indexed journals have been considered as having high quality peer-reviewed publications. Why do they get such good scientific reputation? Does it mean that non-ISI-indexed journals...
03 March 2013 9,864 72 View
Sydnones are mesoionic compounds having a five-membered pseudo-aromatic heterocyclic ring named as 1,2,3-oxadiazole bearing an enolate-type exocyclic oxygen at C5. Usually they bear a substituted...
02 February 2013 5,775 3 View
After we synthesize the compound, we need to purify before we send it for IR and NMR. What is the lowest purity acceptable to run a reliable NMR and IR and how can we evaluate this purity?
02 February 2013 6,165 56 View
is the maximum and minimum values of skewness and kurtosis for a normal distribution?
01 January 2013 2,665 22 View
