Org Prep Daily

July 4, 2013

Happy 4th

Filed under: Uncategorized — milkshake @ 3:22 am
“The difference between theory and practice is much bigger in practice than in theory”

The difference between theory and practice is far greater in practice than in theory

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Credit: Jiri Sliva

 

October 4, 2011

A scent of fresh soil

Filed under: Uncategorized — milkshake @ 5:53 pm

Our lab has been smelling a lot like disturbed soil lately, due to my work with 2-ethylfenchol. The flavor and fragrance division of Aldrich is a good place to start when you need highly hindered tertiary alcohols. While many of the low-molecular weight tertiary alcohols are minty and camphor-like, Et-fenchol smells like dirt. Actually in the concentrated state it reeks similar to TBS-silanol, but stronger. In more diluted form though it has a clean smell of freshly dug-up moist earth –  the smell is persistant and very convincing; a colleague asked me if he could wear ethylfenchol on his shroud when he goes to a Halloween party dressed as a mummy.

Turns out, 2-ethylfenchol prepared from (+)-enantiomer of fenchone has been developed with a specific purpose: as a substitute for geosmin – the terpenoid metabolite produced by soil bacteria that makes soil smell earthy. The earthy note is desirable in some compositions, i.e. for pipe tobacco flavoring, and since geosmin is rather hard to make cheaply a semisynthetic substitute was found. (Water utility companies are less fond of geosmin; the odor threshold of geosmin is incredibly low. Together with 2-methylisoborneol – another dirty-smelling terpenoid from soil bacteria/fungi – geosmin lends awful taste to tap water).

Et-fenchol from Aldrich comes in kosher grade, with a large seal from rabbi Gershon Segal on the bottle:

June 23, 2011

Last post

Filed under: industry life, Uncategorized — milkshake @ 12:57 am

Today is my first day with a small privately held biotech company that is developing self-assembling polymers for targeted drug delivery. The group and the projects are awesome – and as much as I am excited about the research and the company, for obvious reasons I shouldn’t be writing about it. So there will be nothing new to add here. This is it – thank you for visiting!

July 7, 2010

All your structure are belong to us

Filed under: Uncategorized — milkshake @ 7:02 pm

I downloaded Symyx Draw this morning, it is offered as a free program for academia. It is used for drawing reaction schemes, creating SMILES strings, entering structures into Symyx databases, etc. and I am quite anxious to get rid of it: Symyx Draw automatically assigned Chemdraw files to a default association with itself (all files, not just those accessed by/copied into Symyx Draw).  And now when I try to reset the file association back to Chemdraw with the help of Chemdraw file connection prompt my computer would ignore the change. A newly drawn Chemdraw file then comes out with a cheerful Symyx icon and will reopen with Symyx Draw too (unless I rightclick and select Chemdraw from the list)….  I do not wish to have all my Chemdraw files appropriated by Symyx Draw without myself deciding to do so. And its not like that they would have asked during the installation. And I resent that in this way they try to mess with a functionality of a (better) competing software that we have already purchased.

I have had some experience with this company: after Symyx acquired MDL, Symyx stopped offering standalone ACD access subscription. (Available Chemical Directory – the most complete database of commercially-available chemicals, their pricing and vendor contact info). Symyx wanted the MDL customers to switch to their Symyx Discovery Gate “all inclusive” chemical search package which also bundled ACD access in it. The cost of the Discovery gate is so high that many academic institutions cannot afford it; for example my current employer does not have it. But I had the misfortune of struggling with the  Discovery Gate in my previous job – its  Java-heavy web-based interface provides the ACD search functionality too – but for me the most important difference was that a regular search that used to take one or two click per compound with the standalone ACD database from MDL was now taking about ten clicks per compound  in the Discovery Gate (with the extra download delays in between): now try to browse through few hundred compounds in the ACD database with this dog. A Symyx customer service representative informed me that they were not offering the standalone access anymore but I could put my concerns into writing (I wrote them an e-mail and I never received a reply to it).

Also, several times I spoke with our chem-informatics guy at the previous job, about our compound submission database – we used to have a simple one from MDL that worked perfectly well  - before it got integrated into a spiffy new Symyx database. And he too has been really frustrated with the Symyx chemical inventory and bio data integrated database that we were using thereafter for our compounds and biology data and chemical collections and high-throughput screening – all in one unwieldy mammoth database. He told me that he had to eventually get a third party software and write a new interface for us in chemistry just to help us with viewing and searching our compounds after we had entered them into the Symyx database (for which our employer paid hundreds of thousands USD). He said he felt hamstrung by having to work with this enormous and poorly designed package that someone high above in the management had chosen for us.

I suppose is always the same – a ginormous all-inclusive package that hardly does any of its basic functions well – and the company that does not care about the needs of the users and promotes its “complete solutions” to the management folks who actually decide about purchasing this stuff… I have the impression that when Symyx bought MDL it set out to max up the profits while riding on the popularity of MDL software; I think in the long run Symyx will drive away many MDL customers by these tactics and will not create too many new ones because eventually the word gets around. For example the ACD access is pretty important but in the end one can get a list of vendors and commercial availability/pricing info from alternative sources.

_________________________________________________________________________________

The individual Chemdraw licence complete with a decent manual costs about $170 for academia and private users (I bought one for myself last year when I needed to prepare my job presentations). I have no special love for CambridgeSoft but at least they never pulled a surprise like this on me and never told me to go and stuff myself with my concerns.

May 29, 2010

Back in the lab

Filed under: Uncategorized — milkshake @ 12:42 am

Today was my first day at the new job.

March 13, 2010

A job interview

Filed under: Uncategorized — milkshake @ 3:25 pm

I just got first job interview invitation, end of this month. Its for a medicinal chemistry position – at a good place and with a group that I want to work in, and the project is also very interesting  - so please keep your fingers crossed for me.

Also, there won’t be that many updates here in the next few weeks. Maybe I can dig up some procedures from old notebooks but for now I decided put up here an ancient recording (like 40 years old) of a Czech blues song that I am quite fond of. Sorry for the incomprehensible language and less-then-awesome sound quality.

Update (4/2/10): It’s a boy!

Older Posts »

The Shocking Blue Green Theme Blog at WordPress.com.

Follow

Get every new post delivered to your Inbox.

Join 137 other followers