Dal N. L.

7 Questions 12 Answers 0 Followers

Questions related from Dal N. L.

What cause dmso-d6 peak to appear at 3.33 on proton spectra?

The highest peak on the proton spectra supposed to belong to dmso-d6 solvent. However instead of appearing at 2.5, the solvent peak appeared at 3.33. what causes that? I read that it could be HOD...

06 June 2016 3,507 16 View

Why do I keep obtaining my starting material?

I'm reacting a chalcone with guanidine hydrochloride in ethanol in reflux. i keep obtaining the chalcone back after reflux (i compare the melt pt, tlc and ir, all pointed that the product that i...

06 June 2015 2,338 10 View

Can we use chloroform instead of alcohol such as ethanol as solvent for aldol condensation?

Will using chloroform affect the reaction and the product?

04 April 2015 8,818 11 View

Why do I obtain an oily mixture from my organic reaction?

I refluxed a ketone and a substituted benzaldehyde with ethanol as solvent and piperidine as catalyst and use TLC to monitor the reaction. After 28 hours, I stopped the reaction and pour the...

03 March 2015 9,795 19 View

Can somebody share with me some papers on how to synthesize 3-acetyl-7-hydroxycoumarin?

I tried to synthesis the aforementioned compound by reacting 2,4-dihydroxybenzaldehyde and ethyl acetoacetate in the present of piperidine as catalyst. According to the method that I'm using,...

01 January 2015 2,142 15 View

Do you have a reference on melting point of 3-acetyl-8-methoxy-2H-chromen-2-one?

I tried to synthesis a coumarin derivative that is 3-acetyl-8-methoxy-2H-chromen-2-one. One of the way to figure out its purity is through its melting point. However, I can't find a reliable...

09 September 2014 256 7 View

What instrument gives the most accurate melting point?

Recently I used the instrument as attached in the link to measure coumarin's melting point. I was wondering if there is a more reliable instrument that could give the accurate melting point...

08 August 2014 8,993 3 View