Hirbod Karimi

10 Questions 9 Answers 0 Followers

Questions related from Hirbod Karimi

I learned recently that elements 119 and 120 are being attempted by a few teams around the world .Are they really created?

Are there any beyond 118 elements that created and submitted yet?

09 September 2017 5,223 1 View

It is not general, but why usually solvent-free reactions produce higher yields?

Is it due to more interaction between reactants?

12 December 2015 1,110 0 View

Types of chemical bonds

Can a covalent bond form between an anion and a cation? (Such as zirconium phosphate, Zr4+ and PO43-) As you can find in Wikipedia about zirconium phosphate : "Of the four oxygen atoms in the...

09 September 2014 8,365 2 View

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)

09 September 2014 3,848 7 View

Is it possible to dehydrate a molecule in aqueous solution?

For example throw a condensation reaction at 40 or 60 0C.For example, condensation of amines and carbonyl? and what if water were used as solvent?

08 August 2014 8,767 12 View

Can we say " All biocatalysts are enymes"?

Or is it better to say "Enzymes are the most important class of biocatalysts"?

06 June 2014 4,025 1 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?

05 May 2014 6,732 12 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?

02 February 2014 1,742 5 View

Why usually nanoparticles prepared by PVP are smaller than those by PVA?

PVA: poly vinyl alcohol and PVP: poly vinyl pirrolidone. water as solvent.

01 January 2014 9,448 9 View

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

I mean the position and the strength of the peaks.

01 January 2014 8,287 4 View