# Which preposition to use for the reducing agent?

Which expression is correct when we use the prepositions with or by for indicating that the reduction is carried out using $\ce{NaBH4}$ as a reductor:

It is reduced to sodium phenylselenolate with $\ce{NaBH4}$ in alkaline ethanol.

or:

It is reduced to sodium phenylselenolate by $\ce{NaBH4}$ in alkaline ethanol.

• Hi and welcome to chemistry.stackexchange.com. Feel free to take a tour of the site. I improved the formatting of your post; among others by including MathJax. For more information on how to do so yourself, check out the help center, this meta-post or this one. – Jan Dec 13 '15 at 21:09
• Very funny, but there's SE site for learning English, you know? – Mithoron Dec 13 '15 at 21:23
• @Mithoron Well yes, but this is a rather specialistic chemical context. It could be that normal language requires preposition $x$ while chemistry speak requires preposition $y$. Thus I feel that it is OK to post the question here. – Jan Dec 13 '15 at 21:27