Yes, it's called a "1/2 in. Brass Female Sweat Copper Adapter x 3/4 in. Pex Barb Pipe Fitting"
Home Depot | Amazon
Sidenote: it took me quite some time to become efficient for searching these kinds of parts.
Per your comment this part is unavailable to you so you can do this:
- Get a 1/2" female sweat to 1/2" barbed adapter
- If available then do a 1/2" push-to-connect coupling instead since it will help to avoid soldering
- Attach a short (6-12 inches) piece of 1/2" pex
- Get a 3/4" to 1/2" barbed transition
- Not sure about your pipe layout but a 3/4" to 1/2" barbed elbow could be a better choice
- 3/4" x 3/4" x 1/2" reducing tee could also be used depending on where this transition is
Why not just use a 1/2" to 3/4" push-to-connect adapter? It should handle both of those types of piping. This would allow you connect the two bare ends of the two pipes.
https://www.amazon.ca/Coupling-Group-Connect-Fitting-Straight/dp/B08GB88WTD/ref=mp_s_a_1_1_sspa?dchild=1&keywords=push+to+connect+fittings+1%2F2+3%2F4&qid=1619046220&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFVT1pQSUNKRTdFUk0mZW5jcnlwdGVkSWQ9QTA1NTYwNzkzMUhOTzdCUUdXTEY2JmVuY3J5cHRlZEFkSWQ9QTEwNDY3MzIxSENFWFA1TjROTFlOJndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=