http://chemblogs.com/sial_blog//index.php?blog=2&disp=comments en-US http://backend.userland.com/rss 60 Thu, 30 Jul 2009 22:03:51 +0000 YCao [Visitor] c57@http://chemblogs.com/sial_blog// I have to weigh out some POBr3 recently and it wasn't a pleasing procedure to go through. I would appreciate it if there is a solution of this reagent. http://chemblogs.com/sial_blog//index.php?blog=2&title=common_difficult_to_handle_reagents_in_s&more=1&c=1&tb=1&pb=1#c57 Tue, 14 Jul 2009 13:44:19 +0000 dredington [Member] c56@http://chemblogs.com/sial_blog// Thanks for your feed back. Are there any other webcast that you feel would be helpful to your research? http://chemblogs.com/sial_blog//index.php?blog=2&title=webcast_by_professor_ei_ichi_negishi_on_&more=1&c=1&tb=1&pb=1#c56 Tue, 14 Jul 2009 04:45:18 +0000 Mr. Gunn [Visitor] c55@http://chemblogs.com/sial_blog// Thanks so much for putting the whole thing online. So much on the web is short little bits and pieces, it's nice to see something substantial like this. http://chemblogs.com/sial_blog//index.php?blog=2&title=webcast_by_professor_ei_ichi_negishi_on_&more=1&c=1&tb=1&pb=1#c55 Thu, 09 Jul 2009 01:34:11 +0000 sweet smell of salami [Visitor] c54@http://chemblogs.com/sial_blog// All Pd-C dry powder catalysts should have a visible warning on the label "IGNITES METHANOL VAPORS". Unfortunately this is not widely known. Diluted reagents: Na dispersion in solid paraffin wax is an excellent drying agent for THF/benzophenone ketyl stills. It would be nice to have a similar dispersion with the liquid Na-K alloy in paraffin wax. (This liquid alloy is exceedingly hazardous to handle neat - it is best made in situ). Picric acid saturated solution in ethyl acetate. (Picric acid is explosive truck-only item, it is shipped moistened with 35% water by weight). Pre-made TLC-stain dip solutions: Cerium-ammonium-molybdate stain, anisaldehyde stain, basic permanganate stain, ninhydrin stain. Packaging 115% polyphosphoric acid into heat-resistant containers, such as metal can or wide-mouth Pyrex glass bottle. PPA is extremely thick and needs to be heated up before the use (so that it can be poured out from the bottle. A container for PPA that could be placed into glassware drying oven the before use would be an improvement.
Diluted reagents:
Na dispersion in solid paraffin wax is an excellent drying agent for THF/benzophenone ketyl stills. It would be nice to have a similar dispersion with the liquid Na-K alloy in paraffin wax. (This liquid alloy is exceedingly hazardous to handle neat - it is best made in situ).

Picric acid saturated solution in ethyl acetate. (Picric acid is explosive truck-only item, it is shipped moistened with 35% water by weight).

Pre-made TLC-stain dip solutions: Cerium-ammonium-molybdate stain, anisaldehyde stain, basic permanganate stain, ninhydrin stain.

Packaging 115% polyphosphoric acid into heat-resistant containers, such as metal can or wide-mouth Pyrex glass bottle. PPA is extremely thick and needs to be heated up before the use (so that it can be poured out from the bottle. A container for PPA that could be placed into glassware drying oven the before use would be an improvement.]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=common_difficult_to_handle_reagents_in_s&more=1&c=1&tb=1&pb=1#c54 Mon, 06 Jul 2009 16:00:02 +0000 dredington [Member] c53@http://chemblogs.com/sial_blog// Thanks for catching that. I will fix it right now. http://chemblogs.com/sial_blog//index.php?blog=2&title=synthesis_of_substituted_ureas_via_cross&more=1&c=1&tb=1&pb=1#c53 Mon, 06 Jul 2009 04:17:49 +0000 chemblogger [Visitor] c52@http://chemblogs.com/sial_blog// typo methid should be method http://chemblogs.com/sial_blog//index.php?blog=2&title=synthesis_of_substituted_ureas_via_cross&more=1&c=1&tb=1&pb=1#c52 Thu, 02 Jul 2009 02:58:05 +0000 KinasePro [Visitor] c51@http://chemblogs.com/sial_blog// RC should consider 75993: Pd/C 'Moistened with water' which is much less prone to auto-igniting. http://chemblogs.com/sial_blog//index.php?blog=2&title=common_difficult_to_handle_reagents_in_s&more=1&c=1&tb=1&pb=1#c51 Fri, 19 Jun 2009 20:43:23 +0000 RC Mishra [Visitor] c50@http://chemblogs.com/sial_blog// I feel its a good initiative to ask to the chemist their opinion over a blog. These days, in our lab we are using the 10 % Pd-C for various catalytic purpose. We think if there is any innovation in handling these auto igniting materials. Please post your opinion here or mail me at @rcmishra.com. Thanks! These days, in our lab we are using the 10 % Pd-C for various catalytic purpose. We think if there is any innovation in handling these auto igniting materials. Please post your opinion here or mail me at @rcmishra.com.

Thanks!]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=common_difficult_to_handle_reagents_in_s&more=1&c=1&tb=1&pb=1#c50 Fri, 29 May 2009 21:08:33 +0000 Jack [Visitor] c47@http://chemblogs.com/sial_blog// Actually you don't need to log in: http://pubs.acs.org/cen/news/87/i19/8719notw6.html
http://pubs.acs.org/cen/news/87/i19/8719notw6.html

]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=mida_boronates_featured_in_chem_and_engi&more=1&c=1&tb=1&pb=1#c47 Sun, 10 May 2009 04:07:09 +0000 chemblogger [Visitor] c45@http://chemblogs.com/sial_blog// Steve was a very interesting and well respected person throughout the organization. He will be missed. I have some very funny memories of Steve as I wish I was able to get to know him more. http://chemblogs.com/sial_blog//index.php?blog=2&title=in_memorial_to_dr_steven_branca&more=1&c=1&tb=1&pb=1#c45 Thu, 30 Apr 2009 10:12:31 +0000 Jean-Claude Bradley [Visitor] c44@http://chemblogs.com/sial_blog// Sandy - thanks for continuing the conversation about this. The role of science blogging is ever changing. Also good to see you on Orange Island yesterday! http://chemblogs.com/sial_blog//index.php?blog=2&title=blogging_and_scientists&more=1&c=1&tb=1&pb=1#c44 Tue, 14 Apr 2009 15:29:21 +0000 dredington [Member] c43@http://chemblogs.com/sial_blog// Thanks Chris! I have updated the link so this should now go to the correct article. http://chemblogs.com/sial_blog//index.php?blog=2&title=imidazolylsulfonates_as_alternatives_to_&more=1&c=1&tb=1&pb=1#c43 Tue, 14 Apr 2009 15:22:42 +0000 Chris [Visitor] c42@http://chemblogs.com/sial_blog// The link at the end of the text does not direct to the correct article. http://chemblogs.com/sial_blog//index.php?blog=2&title=imidazolylsulfonates_as_alternatives_to_&more=1&c=1&tb=1&pb=1#c42 Tue, 14 Apr 2009 14:40:58 +0000 dredington [Member] c41@http://chemblogs.com/sial_blog// More information is available at the following websites: http://www.pbn.com/detail/41018.html http://www.uri.edu/news/releases/?id=4810 http://www.chm.uri.edu/display_abstract.php?email=bdeboef&from=facres&back=Faculty%20and%20Research&this=facres.php http://www.pbn.com/detail/41018.html
http://www.uri.edu/news/releases/?id=4810
http://www.chm.uri.edu/display_abstract.php?email=bdeboef&from=facres&back=Faculty%20and%20Research&this=facres.php]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=new_c_c_bond_formation_method&more=1&c=1&tb=1&pb=1#c41 Tue, 14 Apr 2009 12:38:28 +0000 Heather [Visitor] c40@http://chemblogs.com/sial_blog// I would like to know more about this method, but where can I read about him? I would like to know more about this method, but where can I read about him?]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=new_c_c_bond_formation_method&more=1&c=1&tb=1&pb=1#c40 Fri, 27 Feb 2009 05:07:44 +0000 Hiro [Visitor] c38@http://chemblogs.com/sial_blog// Thanks for writing about us Sandy. http://chemblogs.com/sial_blog//index.php?blog=2&title=jean_claude_bradley_organic_chemist_cham&more=1&c=1&tb=1&pb=1#c38 Wed, 04 Feb 2009 20:30:49 +0000 dredington [Member] c37@http://chemblogs.com/sial_blog// Thanks for catching the error --- the corrected scheme is now displayed. http://chemblogs.com/sial_blog//index.php?blog=2&title=organocatalytic_synthesis_of_lactones_fr&more=1&c=1&tb=1&pb=1#c37 Wed, 04 Feb 2009 16:01:00 +0000 a [Visitor] c36@http://chemblogs.com/sial_blog// A mistake in this page. Lactone was formed in the paper , but here is aldehyde. but here is aldehyde.]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=organocatalytic_synthesis_of_lactones_fr&more=1&c=1&tb=1&pb=1#c36 Mon, 01 Dec 2008 14:50:38 +0000 jnakhla [Member] c34@http://chemblogs.com/sial_blog// That is an excellent point. What I should have written is "without prefunctionalization." I will change it. Thanks! "without prefunctionalization." I will change it. Thanks!]]> http://chemblogs.com/sial_blog//index.php?blog=2&title=title_4&more=1&c=1&tb=1&pb=1#c34 Sun, 30 Nov 2008 15:19:44 +0000 Tex [Visitor] c33@http://chemblogs.com/sial_blog// One might argue that the pyridine nitrogen serves as a directing group. http://chemblogs.com/sial_blog//index.php?blog=2&title=title_4&more=1&c=1&tb=1&pb=1#c33