Dear All,
I know that Trispentafluoroborane is air sensitive but need to know how much it is sensitive. When I run reactions with this catalyst do i need to pay very carefully attention for inert atmosphere or not?
Thanks!
Iryna
Do you mean tris pentafluorophenylborane. It is not terribly air sensitive. The following is from: https://pubs.rsc.org/en/Content/ArticleLanding/1997/CS/cs9972600345#!divAbstract
"Compared to the boron trihalides, tris(pentafluorophenyl)borane is in many ways an ideal boron-based Lewis acid, possessing both high Lewis acid strength and stability. It is remarkably thermally robust; while many fluorinated boron compounds tend to decompose by eliminating BF3, B(C6F5)3 is stable for several days at temperatures up to 270 °C. It is also resistant towards oxidation by molecular oxygen and is water tolerant. Hydrolysis to eliminate C6F5H does occur, but only very slowly; in fact, some organic reactions catalysed by B(C6F5)3 can be carried out in aqueous solution. The compound forms a strong and stable adduct with water which can be isolated as a trihydrate (H2O)2H2O·B(C6F5)3.14 In terms of Lewis acid strength, it was surmised by Massey and Park that B(C6F5)3 is a slightly better Lewis acid than BF3 but not as strong an acceptor as BCl3, as judged by spectroscopic comparisons between amine adducts of a number of these boron-based Lewis acids. Finally, it can be prepared base-free (although it is extremely hygroscopic in this form) and it is soluble in many non-coordinating organic solvents."
https://www.quora.com/Does-anyone-feel-that-there-is-too-much-talk...
Sorry, T.H. Al-Noor, the page you recommended didn't open in my App, could you send it in another form? Thanks!
Joseph S Merola has already given a very satisfactory answer. Usually, flouro- derivatives are less moisture sensitive (I would say moisture sensitive; if air is very dry and no moisture content, then it does not do any harm unless the molecules are sensitive to molecular oxygen. When we say anything air sensitive, moisture content is counted and most of the compounds, in general, are moisture sensitive and not air sensitive) but that may not be true in the case of p-block compounds, especially electron deficient molecules. Preferably carry out the reactions under inert atmosphere using standard Schlenk and vacuum line techniques. Further, tris(pentafluorophenyl)boron is a volatile solid.
- Badges
- Science topic
- Similar topics
- Chemistry
- Organic Chemistry