EXP259

=Researcher= Alex Greene

=Objective= Determination possibility of hemiacetal in reaction of 4-chlorobenzaldehyde in ethanol. =Procedure=

=Results= [|NMRsheet-1]
 * [What did you find in the NMR? Right now showing a nonsensical negative concentration in the sheet JCB]**

NMR Sheet 1 [|http://lxsrv7.oru.edu/~alang/ChemDoodleWeb/spectrumwidget.php?url=http://onschallenge.wikispaces.com/file/view/abgexp258_greencap.jdx]

=Discussion=
 * [How do your results compare with previous reports of hemiacetal formation? JCB]**

=Conclusion=
 * [You have enough to answer the objective: did you find any hemi-acetal? JCB]**

=Log= 13:25-3.2011g of 4-Chlorobenzaldehyde added to 20 ml Test Tube #1 13:30-3.2006g of 4-Chlorobenzaldehyde added to 20 ml Test Tube #2 13:44-10ml of absolute ethanol added to each Test Tube #1 and #2 (Solid 4-Chlorobenzaldehyde remains in Test Tube #1 and #2) 13:45-Test Tube #1 and #2 placed water bath at 27C (Solid 4-Chlorobenzaldehyde persists) 13:50-Test Tube #1 and #2 in water bath at 30C (Some solid 4-Chlorobenzaldehyde persists) 13:54-Test Tube #1 and #2 in water bath at 37C (Solid 4-Chlorobenzaldehyde dissolving but some persists) 13:57-Test Tube #1 completely dissolved, water bath at 39C (Solution appears to be homogeneous) 14:01-Test Tube #2 completely dissolved, water bath at 39C (Solution appears to be homogeneous) 14:01-Test Tube #1 placed in 25C water bath and Test Tube #2 placed in 3C ice bath 14:03-Test Tube #1 water bath at 26C, Test Tube #2 ice bath at 3C 14:04-White precipitate forming on sides of Test Tube #2 (Ice bath temperature 4C) 14:05-Test Tube #2 white precipitate frozen and removed from bath, Test Tube #1 beginning to precipitate 14:19-Frozen precipitate from Test Tube #2 vacuum filtered 14:23-Test Tube #1 removed from 24C water bath (Only minimal precipitate formed,not enough for NMR) See picture #1 **[pic missing from results JCB]** 14:32-Filter paper removed from vacuum funnel and dried crystals from Test Tube #2 placed in Vial #2 for NMR **[name NMR JCB]**
 * [missing date JCB]**