Hirbod Karimi

14 Questions 6 Answers 0 Followers

Questions related from Hirbod Karimi

Is anybody familiar with the Biginelli reaction?

In the synthesis of 3,4-dihydropyrimidin-2(1H)- ones, in the last step of the reaction mechanism, why does an imine be produced not an enamine? (see attached file)

02 September 2014 7,219 6 View

Is there any way to determine the pH of a heterogeneous Bronsted acid catalyst?

With regards to silica-sulfuric acid, heteropoly acids or zirconium phosphate.

03 July 2014 572 5 View

Are there any ways to be sure that all protons of (-OH) groups on the surface of silica, zirconium phosphate are exchanged by cations such as Zn, Cu?

I mean any instrumental techniques.

13 June 2014 8,731 3 View

Why is a bond between an sp2 carbon and an sp3 carbon stronger than a bond between two sp3 carbons?

Is this about steric factors?

11 May 2014 797 9 View

What is a suitable internal standard for the quantification study of cyclohexylphenol GC analysis?

I want to perform GC analysis to obtain quantification data about amount of products (cyclohexylphenol). Is 2-butanol a good choice?

15 March 2014 5,604 0 View

Is it possible to determine the amount of oxygen in a compound by any kind of ICP?؟

Can we calculate the amount of other atoms (from ICP data) and then calculate the amount of oxygen?

15 March 2014 3,842 4 View

Is it possible to determine the amount of oxygen in a compound (such as ZrO2 or Zr(HPO4)2) by "ICP-OES" or any other kinds of ICP?

Is there any better way than EDS?

12 March 2014 7,650 3 View

Why does the phenolic -OH react with acetic anhydride but not acidic -OH in Aspirin synthesis from salicylic acid and acetic anhydride?

Is this because of more nucleophilicity of phenolic -OH?

16 February 2014 2,735 4 View

What does the high activity of zirconium phosphate come from?

Is it due to its layer structure or well ordered (P-OH) groups on the surface?

30 January 2014 5,487 2 View

Is it possible to perform TPD-NH3 or Py-FTIR analysis of an ionic liquid?

If I immobilize the ionic liquid on a surface, is this possible to perform the analysis now?

28 January 2014 6,427 1 View

What does a "Pyridine- FTIR analysis" can tell me?

I mean the position and the strength of the peaks.

26 January 2014 2,363 3 View

The TPD-NH3 analysis can tell you the presence of amount of Brønsted acid sites on the catalyst. - is this correct?

What techniques can be replaced?

26 January 2014 2,216 7 View

What is the best way to determine the amount of metal on the surface of silica, zirconia or zirconium phosphate?

We used copper to impregnate the surface of silica, zirconia or zirconium phosphate

12 January 2014 2,288 12 View

Why do 2d or 1p orbitals not exist?

(energy levels).

10 January 2014 2,047 6 View