The first preparation of an unsymmetrical 1,3-diphospha-allene carrying 2,4,6-tri-t-butylphenyl and 2,4,6-tri-t-pentylphenyl as protecting groups
Abstract
1-(2,4,6-Tri-t-butylphenyl)-3-(2,4,6-tri-t-pentylphenyl)-1,3-diphospha- allene was prepared from the corresponding unsymmetrical diphosphene and the NMR coupling constant 2JPCP was observed for the first time.