Inorganic friends. Who do you use for CHN? My current vendor has gone downhill and I won’t use them again. My invoice on a rushed air sensitive sample was “not forwarded” and it is now a week later and only my follow up email prompted a response. In my more recent interaction with them, I had to email to request my data after it was not sent to me after a month or 6 weeks. Thanks.

My student sent a labeled compound for CHN analysis.  Her data came back all wrong.  I remembered (in the dim recesses...) that when doing CHN analyses for deuterated compounds, you have to do something different.  But I have no idea what it is.  But, technology has advanced in the intervening years, so I had chemdraw automatically calculate numbers.

Chemdraw calcd for C₁₄H₁₅D₆NO₂:  %C:  69.67, %H:  11.27, %N:  5.80

Chemdraw calcd for C₁₄H₂₁NO₂:  %C:  71.46, %H:  8.99, %N:  5.95