Dal N. L.

7 Questions 11 Answers 0 Followers

Questions related from Dal N. L.

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...

22 June 2015 9,517 9 View

How do you prepare alcohol free chloroform?

Can anyone kindly share on how to prepare alcohol free chloroform? the alcohol free chloroform will be used for bromination of 3-acetylcoumarin. thank you in advance.

19 April 2015 5,597 3 View

What other base can be used in exchange of sodium methoxide?

our lab does not provide sodium methoxide. what other base can i use that have the same properties as sodium methoxide? thank you.

08 April 2015 8,657 13 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?

07 April 2015 6,339 10 View

Can anyone recommend a procedure to characterize coumarin using UV-Vis?

I have synthesized coumarin derivatives and one of the characterization is using UV-Vis. Since I don't have the standard for the synthesized compound, do I still need to run the standard...

04 February 2015 1,189 4 View

What may have caused the melting point to increase other than impurities?

I tried synthesizing 3-acetyl-8-methoxycoumarin and obtained a compound with melting point range of 206-210 degrees. In the literature, melting point ranges from 171-172 degrees. I further...

14 October 2014 2,283 3 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...

17 September 2014 796 6 View