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Organic Chemistry Forum / Substance that reacts with DPM
« Last post by stephenflam on Today at 12:15:44 AM »Hello, Does anyone know what substance can cause a discoloration reaction with DPM (Dipropylene Glycol Monomethyl ether)?
Recent Posts
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Organic Chemistry Forum / Refresher on modern organic chemistry
« Last post by cbloom on Yesterday at 10:57:48 PM »I left organic chemistry about 5 years ago and transferred over to molecular and cell biology, I've gotten rusty and would love to catch up on recent developments in synthetic organic chemistry. Would love to be pointed in the direction of some great review articles or textbooks that can freshen me up on modern techniques and approaches. Mostly for general synthesis as opposed to bespoke total syntheses. Any ideas?
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Organic Chemistry Forum / Re: Mass spectrum for 4-methoxybenzaldehyde
« Last post by billnotgatez on Yesterday at 10:17:55 PM »we only post a given question once on the forum
I have deleted all your other copies
I hope someone will respond
I have deleted all your other copies
I hope someone will respond
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Biochemistry and Chemical Biology Forum / Proline found on helix or sheets?
« Last post by woole on Yesterday at 07:52:09 PM »Where is Proline residue located? Would it be found on both helix and sheets or on helix only? and where on the structure would it be found?
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Other Sciences Question Forum / Shimadzu QP5050A software?
« Last post by ifd3f on Yesterday at 06:33:39 PM »Hello,
I and a group of hobbyists have managed to acquire a used Shimadzu GC-17A and QP5000A GCMS unit from the mid-90s. Unfortunately, it didn't come with the PC software, so I'm wondering, does anyone have access to a copy of the PC software for it that we could examine and decompile?
We're currently trying to pull firmware off the device so that we can reverse engineer the protocol it uses, and write a driver for it able to run on a modern operating system, but having desktop-side software available would definitely make the process easier. If we do successfully reverse engineer it, we'll post what we've managed to get on GitHub.
I and a group of hobbyists have managed to acquire a used Shimadzu GC-17A and QP5000A GCMS unit from the mid-90s. Unfortunately, it didn't come with the PC software, so I'm wondering, does anyone have access to a copy of the PC software for it that we could examine and decompile?
We're currently trying to pull firmware off the device so that we can reverse engineer the protocol it uses, and write a driver for it able to run on a modern operating system, but having desktop-side software available would definitely make the process easier. If we do successfully reverse engineer it, we'll post what we've managed to get on GitHub.
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Organic Chemistry Forum / Mass spectrum for 4-methoxybenzaldehyde
« Last post by Blank19rh on Yesterday at 05:34:00 PM »I have a mass spectrum for 4-methoxybenzaldehyde and have 2 fragment ion peaks at 107 and 92. It is an EI+ GCMS and I wanted to know what the fragment ion at 92 was and the mechanism to form that fragments. Thank you
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Organic Chemistry Forum / Re: Degradation of aspartame at pH 8
« Last post by rolnor on Yesterday at 04:19:14 PM »Yes ninhydrin reacts with a lot of amino containing stuff.
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Organic Chemistry Forum / Re: Degradation of aspartame at pH 8
« Last post by Babcock_Hall on Yesterday at 10:33:36 AM »The starting material, aspartame, has a free amino group and should be positive in a ninhydrin test.
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Analytical Chemistry Forum / Re: Does N,n-dimethylformamide show up on TLC?
« Last post by Babcock_Hall on Yesterday at 10:13:56 AM »It should not absorb strongly. Its presence may change Rf values of other compounds, depending upon the solvent system. I have sometimes thought about removing it from TLC samples, but I have not actually done so.
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Physical Chemistry Forum / Salt solution separation
« Last post by roilaa on Yesterday at 07:46:13 AM »I have a solution containing approximately 200 g/L NaCl and 100 g/L KCl. I am trying to separate into the individual salts but without a huge energy input if possible. By chilling the solution the KCl should crystallise first, which should make it filterable but is there any easier way to do this?
Any help greatly appreciated.
Any help greatly appreciated.
