# Have P-acyl phosphines ever been synthesized?

I've done some amount of searching and can't seem to find any evidence in the literature that there exists a phosphine analogue of carboxyl amides. I'm looking for compounds of the form $\ce{ R(C=O)PR_{2}}$; basically a moeity similar to a primary or secondy amide but with a phosphorous atom instead of a nitrogen.

I would also wonder what the proper name for these functionalities would be. Taking a shot in the dark I might guess "phosphomide", "acyl phosphine", or "acyl phosphinide".

I would like to specifically disqualify Acyl-phosphine oxides or any compounds where the acyl-connected phosphorous is also connected to an oxygen.