Well I looked at your statement
Can I make it by simply dissolve BH3 in THF?
and then looked at the WIKI page
Safety
The solution is highly sensitive to air, requiring the use of air-free techniques.
and many of the
GHS precautionary statements
on that page.
There seemed to be a disconnect.
Sometimes the best WIKI information is not the page itself but the links to the
References
Also I have been told that ACS members patrol WIKI to try and keep it authoritative.
Although the WIKI tends not to give specific recipes.
The way you couched you question
it appeared to me that you had not followed the forum rule for member participation.