1-(triphenylphosphoranylidene)acetone 1439-36-7 2-propanone, 1-(triphenylphosphoranylidene)- InChI=1/C21H19OP/c1-18(22)17-23(19-11-5-2-6-12-19,20-13-7-3-8-14-20)21-15-9-4-10-16-21/h2-17H,1H