Comments for TotallySynthetic.com http://totallysynthetic.com/blog 4,512 Ph. D. students died to make this blog... Sat, 19 Jan 2013 11:46:58 +0000 hourly 1 http://wordpress.org/?v=3.5.1 Comment on AUP by BRSM http://totallysynthetic.com/blog/?page_id=32&cpage=1#comment-609123 BRSM Sat, 19 Jan 2013 11:46:58 +0000 http://totallysynthetic.com/blog/?page_id=32#comment-609123 If one needs dry (and iron free) ammonia it’s normal to first condense the gas from a cylinder into a two or three neck rbf in a dry ice-acetone bath where it can be dried by addition of pieces of sodium/potassium (’til it goes blue, then leave it for 15 min). This flask can then be removed from the cooling bath, allowing the dry ammonia to evaporate. A tube from this drying flask to your reaction flask will allow the dry ammonia to be passed through your reaction. Ammonia evaporates pretty slowly, so you can get a reasonably controlled stream of dry gas this way. I believe this set up is described in the Organic Syntheses entry for the preparation of anisole (it’s standard procedure to do this for Birch reductions, and particularly Birch reductive alkylations)

]]> Comment on AUP by Dante http://totallysynthetic.com/blog/?page_id=32&cpage=1#comment-605896 Dante Mon, 31 Dec 2012 16:45:39 +0000 http://totallysynthetic.com/blog/?page_id=32#comment-605896 Hi everybody. I have a question, and if someone have someone have some expertise about this, i will be gratefully forever. I’m trying to synthesize general structures of 1,3-diiminoisoindolines for phthalocyanines synthesis. In the general procedure, gaseous ammonia is bubbled in the solution of NaOMe/MeOH. But ammonia gas need to be anhydrous before bubble in the alcoxyde solution of such systems. Does anyone knows how to dry ammonia in cases like that? Is there any specifucally apparatus or discribed method? I have tried someones but with no success in any.

Best regarts
Dante.

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