04-25-02 01:25
No 300989
Foxy, not too high to calculate...
But Uemura is,... thanks foxy, uemura is still too tired to play around with variables. Uemura is sure that there is around a piece of SW you can feed in all the variables you want to calculate. Just take a simple example:
x P2O5 + y PCl5 + z_input --> a POCL3 + b output_
Here we are lucky, Take x=1 y=3 and a=5 (of course z=b=0). Here you have a set of equations like:
x (2 P + 5 O) + y (P + 5 Cl) =
(2 x + y) P + 5 x O + 3 y Cl ==
a P + a O + 3 a Cl
or
(P) 2 x + y == a
(O) 5 x == a
(Cl) 5 y == 3 a
which is a set of an integral equation system with 3 equations and three variables, solutions are seeked within the range of positive integral numbers. this is also called a diophantic equation. (For details see S.L.Borevcs, L.R. Safarevics, Number Theory, Birkhäuser, 1966 )
If you haven't started with PCl5 but with PCl3, then you would have to add an additional variable, say u * Cl2 (It still seems you know about chemistry, because you haven't added u * He2).
u Cl2 + x P2O5 + y PCl3 + z_input --> a POCL3 + b output_
which is now again a diophantic equation (4 vars, 3 eqs!!!) as
(P) 2 x + y == a
(O) 5 x == a
(Cl) 3 y + 2u == 3 a
with the obvious (smallest integral solution!!!) solution x=1, y=3 ,u=3 and a=5.
In case you know the additional input and output z_input, b_output is zero (i.e. your are a good chemist to know what you need and what you get out), then at least you know the number of variables to deal within the diophantic equations. If not, then you are in trouble.... Uemura thinks you get a feeling what he is looking for in general. Either you are a genius chemist or a good mathematician, but in the latter one you nevertheless need to know the number of variables you deal with..
Anyway, looking at the pot with the crude TMP after destilleation of the MeOh, another salt precipitated, it is white, is it now Cu(I)Cl or just NaCL. Two more variables.......
Jesus, why didn't Uemura stick with what he learned....
(Official Hive Translator)
04-25-02 06:23
No 301098
Our beeloved Chemistry Lover Diafrag of HyperLab recently scanned and uploaded that very article to his site http://chemlover.narod.ru. There are some points in it that could bee helpful to the future generations
:1) The optimal rxn time (they say) is 50 C, but it is absolutely uncrucial - like 25 C is good (173 hours for MeOH) - 100% yield.
2) Lower alcohols are converted into TAlkP's - although EtOH gives about 33% triethylphosphite as a byproduct (again, at RT, 246 hrs).
3) Higher alcohols are converted to dialkylphosphates - but they react further to TAlkP's if the water formed is azeotropically removed. Again, some TAlkP-ites are formed as byproduct.
4) There is actually a table summarizing the rxn kynetics at RT for different alcohols - i am too as-busy-as-a-bee
to type it in, read it in the original at http://chemlover.narod.ru/articles/artic5) They state the rxn equation to bee:
NaOH2PO + 4 CuCl2 + 3 ROH ----> 4 CuCl + NaCl + 3 HCl + H2O + (RO)3PO4
6) BUT you know what - "....cuprous chloride formed is re-oxidized by air to cupric chloride..." so they actually perform the rxn (at RT and long time) in ambient atmosphere , with molar concentrations of the reagents being actually 1,14 g/mole NaH2PO2 and 0,74 g/mole CuCl2.
It also suggest a possible explanation, as well as a possible tremendous improvement for Half-A-Pint's DMS synthesis (BTW, Uemura, earlier in this thread you say that your attempts to make DMS failed - what did you mean? Did you try the CuCl2 method?)
7) Finally, cupric bromide cannot bee substituted for chloride in this reaction.
Antoncho
(Hive Photographer)
04-25-02 10:18
No 301174
Antoncho,
Thanks a lot for the deeper insight... Uemuras observations now make sense. He hasn't however smelled any HCl during the run, perhaps it stayed in the MeOH?
BTW, Uemura, earlier in this thread you say that your attempts to make DMS failed - what did you mean? Did you try the CuCl2 method?)
No, uemura hasn't tried the CuCl2-DMS synthesis yet. Up to now he only tried the get TMP, no DMS yet.
Carpe Diem
(Hive Bee)
04-28-02 05:54
No 302386
Check these out.
BTW these are precursors for nerve gas precursors and in particular VX.
us5710307 process for the production of trialkyl phosphites
us2636048 method of producing trialkyl phosphate esters
us2410118 method of producing trialkyl phosphate esters
us4714771 process for preparing halogenated trialkyl phosphate esters
us1844408 production of phosphoric acid esters of aliphatic alcohols
us2005619 esters of acids of phosphorus
us3068269 process for producing trialkyl phosphites
us2905705 process for the manufacture of trialkyl phosphites
us1028384 process for preparing trialkyl phosphites
us1408744 process for producing esters
us2848474 method of producing and recovering trimethyl phosphates
OTEECEE & meeeee!!!!
(Hive Addict)
08-22-04 03:49
No 526669
Here's the pics that are now missing in Post 265013 (uemura: "Methylation with (CH3)3PO4", Chemistry Discourse).
--psyloxy--
(Chief Bee)
08-31-04 23:00
No 528576
Thank you! I have reinserted those pixtures into the appropriate post and added Uemuras writeup to the document at ../rhodium /me3po4.
The Hive - Clandestine Chemists Without Borders
(Hive Bee)
09-04-04 21:32
No 529571
(Rated as: good read)
Acid Catalysis of Phenol Etherifications With Trialkylphosphates
Patent US2683784
Example 2
Seventy-one grams of phenol (0.75 mole), 40 grams of trimethylphosphate (0.286 mole) and 0.5 gram of p-toluene sulfonic acid were heated together. The reaction was proceeding slowly so 1.0 gram more p-toluene sulfonic acid was added and the reaction proceeded rapidly. The anisole was distilled out of the reaction mixture through a short column; B. P. 155-158o C., yield 75 g. (92 per cent).