[OrganicDan96]

I have a synthesis that involves converting a ketone to an O-methyloxime then reduction with BH3.THF to give an amine. is there a reason for the methyl group? Because O-methylhydoxylamine hydrochloride is rather expensive and i would like to see if i can try the synthesis with the OH Oxime to save cost but could this be a problem?

[pgk]

Yes, there is. You need an excess of diborane and have to heat above 100oC, to finally obtain lower yields:
Reduction of oximes, oxime ethers, and oxime esters with diborane. Novel synthesis of amines, J. Org. Chem., (1969), 34(6), 1817–1821
https://pubs.acs.org/doi/abs/10.1021/jo01258a062?src=recsys&journalCode=joceah