There's two Tetrahedron Letters references in this thread posted by No_dream
https://www.hyperlab.info/inv/index.php?act=ST&f=17&t=29192&s=9993374effaf0b4c54aa219acb63f3ce
which use the less toxic ferrocyanide instead of the usual cyanide for making benzyl cyanides.

More commonly known synth
http://www.orgsyn.org/orgsyn/prep.asp?prep=cv1p0107