Dear Nadia,

does the aromatic region fit (see attachment)? With two singulets it is NOT BenoylBenzoate...

One of possibility is that out of two singlet one may be due to Dichloromethane, one of most common impurity of Chloroform NMR solvent. ( CH2 singlet appears between 5.0 to 5.5)

...Tabrez's idea (that it is an impurity!) may be subtantiated by looking on the integrals...are both singulet integrals identical or clearly different?

Alfred

First you are not referring to benzoyl benzoate but to benzyl benzoate.

Second, even using a high field NMR (400 MHz) only a singlet is observed

http://www.rsc.org/suppdata/c7/ra/c7ra02788e/c7ra02788e1.pdf

Best regards

Henri

Yes, benzyl benzoate (NOT benzoyl benzoate) has a 1-H NMR singlet at 5.22 ppm.

Benzoyl benzoate has only signals in the aromatic region of the spectrum.

Also look at the ingrals of your two singlets...

Abel J S C Vieira Henri Strub Alfred Ross Tabrez Shaikh

Thanks a lot for your precious suggestions.