Organic and organometallic derivatives of pentaphenylbenzene, C6Ph5X: correlation of peripheral phenyl ring orientations with the steric bulk of “X”

A series of C 6 Ph 5 X compounds, including X = H, Br, CO 2 H, CO 2 R, C[Formula: see text]CPh, cis-BrC=C(Br)Ph, 2-bornenyl, and ferrocenyl, have been characterized by use of X-ray crystallography. Also, the first organometallic complexes of pentaphenylbenzene have been prepared by reaction with chromium hexacarbonyl to yield (η 6 -C 6 Ph 5 H)Cr(CO) 3 complexes in which the metal tripod is attached either to an ortho peripheral ring or to the …