1., when climbing the board, forget to remove the TLC board until the solvent reaches the top.
2. forget the weight of the weighing bottle.
3., I forgot to shut off the stopcock of the liquid funnel in time.
4. when the column is over, the product is lost.
The 5. column is dry.
When the 6. is steamed, the flask containing products is put into the bath pan.
7. when steaming, forget the vacuum. .
8. when the rotary steam stop bumping.
9., pour the reaction fluid into the separation funnel of the plug.
10. the stirrer and the reaction fluid go into the separation funnel together, and the result is that the stirrer breaks the separation funnel.
11. to do NMR, only deuterium solvent, forget to add...
12., I believe my memory is very good, many samples do not write labels, and I regret after second days.
13. forget to open the circulation water.
14. believe that the solvent is absolutely pure and absolutely no water.
15., until the reaction is processed, it is found that one substrate is added less.
16. feed material, add the wrong material.
The raw material is not confirmed before 17. materials.
In the course of 18. feeding, the reaction bottle was found to be small.
19. when the reaction was quenched, it was found that the reaction bottle was too small.
20. when the sample is taken, the bottle is broken.
21., when calculating the feed ratio, the content of raw materials is not considered.
22., when calculating the feeding ratio, a decimal point is mistaken.
23., believing in an unreliable reaction can happen miracles.
When the 24. liquid is divided, the product layer is discarded.
25. the agitator breaks the bottle.
26. to remove the product, only to break the bottle.
27. the reaction bottle slips into the oil bath.
28. multi - component parallel tests, confusion of batch number.
29. during the night reaction, the circulating water pipe falls off the condenser.
30. break the bottle when washing the bottle.
31., there is a gas release reaction in closed system.
32. extraction, the dead is not stratified.
When 33. of the sodium cut, a sneeze was made.
34., open the fridge, forget to turn off, remove the reagent from the fridge, and forget to return.
35. people take away the bottle you weigh.
36. temperature control is out of order.
38. vacuum bumping.
39. use ether, old sleepy.
40., when we climb the board, someone else will steal your board away.
41. with stirring sleeve blood transfusion set of glass, the glass break, prick bleeding.
42., there is no grease on the plug, and all the bottles can't be opened.
43. the original condition is poor, the condensing tube / vacuum tail nozzle / single port flask / decompression is concentrated, and the result of the vacuum drawing process is stabbed and stabbed through the bottom of the flask.
44., the material is placed in a beaker and dissolved in ultrasound. As a result, beaker is poured into the water.
45., reflux, do other things, stop the cooling water halfway, and the solvent runs more than half.
46., the reflux reaction with large charge coefficient will not be shut down in the middle, and will be sent to the head after a sudden call.
47., put a half beaker and colorless liquid on the test table, think it is water, ready to throw it away, or confirm it with the nose. The result is ammonia water, brain amnesia for 5 seconds.
48. cylinder sleeves meet, pour off the cylinder on the table, but also the amount of half of the volume.
49. oil pump for pumping, repeatedly put ice cold trap blocked cause no vacuum.
50., when the vacuum distillation is too high, it will cause no stirring.