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o-Phthalic Acid Ester Syntheses
It is important to use absolute ethanol for the production of the monoethylester. Otherwise you get ... |
23-4-2009 at 07:16
by: grind |
diphenyl ether
Diphenylether should be absolutely safe concerning peroxides. I´ve read alot about peroxides in org ... |
23-4-2009 at 06:40
by: grind |
The Wang-Hendrickson Synthesis
[quote][i]Originally posted by Sauron[/i]
The SOCl2 was used to introduce the Cl at the 3-position[ ... |
1-1-2009 at 08:23
by: grind |
The Wang-Hendrickson Synthesis
SOCl2 can be replaced by PCl5 or oxalyl chloride or phosgene. Another possibility is to avoid the wa ... |
1-1-2009 at 06:57
by: grind |
Concentrating H2O2
[quote][i]Originally posted by not_important[/i]
You don't distill the H2O2 itself, just remove wat ... |
31-12-2008 at 03:24
by: grind |
Suggestions for kg quantities of ZnBr2? [for zinc bromide batteries]
Dry ZnBr2 should be soluble in ether as ZnCl2 does. That is a possible way to further purification a ... |
30-12-2008 at 13:20
by: grind |
Concentrating H2O2
As far as I know H2O2 can be concentrated by vacuum distillation with the aid of a good column. Of c ... |
30-12-2008 at 12:38
by: grind |
Drying HBr... has anyone considered this?
[quote][i]Originally posted by woelen[/i]
If you want a really lossless drying agent, then you most ... |
30-12-2008 at 10:55
by: grind |
Preparation of methyl tosylate, safe methylating agent
Tosylate esters are strong cancerogens, like most alkylating agents. They may have preparative advan ... |
30-12-2008 at 02:47
by: grind |
Sodium Cyanide recipe via ferrocyanide
[quote]
[i]Originally posted by vassili78[/i]
In order to obtain a pure form, melt dried ferrocyan ... |
24-12-2008 at 13:58
by: grind |
Synthesis of o-phenylenediamine
[quote][i]Originally posted by Sauron[/i]
Now you can oxidize.
Two things to bear in mind:
1. ... |
20-12-2008 at 03:38
by: grind |
Acid to aldehyde w/o hydrides?
A rather clean conversion of acids to aldehydes (unfortunately with hydrides) takes place as follows ... |
20-12-2008 at 03:32
by: grind |
Help: Failed chloromethylsulfonyl chloride Prep
The KClO3-method:
Suspend 13,8 g trithiane in 500 ml 37% HCl. Stir and cool with water during the p ... |
18-12-2008 at 09:00
by: grind |
How to use AlHg Amalgam on Indole?
[quote][i]Originally posted by chemrox[/i]
I wonder if this would help with STAB reductions; do ami ... |
17-12-2008 at 21:10
by: grind |
How to use AlHg Amalgam on Indole?
@Fleaker:
May be it is dependent on the crystal modification. But even if you bring the precipitate ... |
17-12-2008 at 11:03
by: grind |
How to use AlHg Amalgam on Indole?
It would be very nice if enough NaOH really dissolves the Al(OH)3 derived from LAH (to give soluble ... |
16-12-2008 at 23:38
by: grind |
How to use AlHg Amalgam on Indole?
By the way, is the Al(OH)3 generated from Al/Hg soluble in NaOH-solution?
Al(OH)3 from LiAlH4 react ... |
16-12-2008 at 15:24
by: grind |
Help: Failed chloromethylsulfonyl chloride Prep
In your first reference article is a note:
Glacial acetic acid is a suitable solvent for crystalliz ... |
16-12-2008 at 15:20
by: grind |
Help: Failed chloromethylsulfonyl chloride Prep
I agree with Klute. In the presence of TCCA side reactions are likely. Following the original proced ... |
16-12-2008 at 14:29
by: grind |
flash chromatography column
Good to know!
What do you think is an ideal drying temperature for the silica gel? 100°C at 0,1 mm ... |
13-12-2008 at 06:52
by: grind |
How to use AlHg Amalgam on Indole?
As far as I remember correctly STAB reduces indoles to indolines. LAH should work, and I think also ... |
12-12-2008 at 04:49
by: grind |
flash chromatography column
In the chemical literature there is a tendency to chromatographe nearly all products. In many cases ... |
11-12-2008 at 09:33
by: grind |
Secondary->Tertiary amines... modern methods
[quote]
The Grignards need to be prepared by the exchange reaction, which is typical of Knochel’s ... |
11-12-2008 at 01:18
by: grind |
TLC monitoring progress of STAB reductive am
I filtered my reduction mixture through a simple small glass filter frit (so called G4 frit), that w ... |
10-12-2008 at 07:04
by: grind |
TLC monitoring progress of STAB reductive am
[quote][i]Originally posted by stoichiometric_steve[/i]
The solid is H3BO3 (borates with basic quen ... |
26-11-2008 at 06:24
by: grind |
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