Upvote:2
According to the Central Bank of Turkey, the following currencies are commonly exchanged in banks:
USD, AUD, DKK, EUR, GBP, CHF, SEK, CAD, KWD, NOK, SAR, JPY, BGN, RON, RUB, IRR, CNY, PKR
Therefore it is unlikely that you would be able to exchange Yemeni rial (YER) anywhere in Turkey.