CP

CP, Cp, cP, cp, cp., or C.P. may refer to:

• The Canadian Press, a Canadian news agency
• The Christian Post, a news web site
• Chuck Palahniuk (born 1962), American writer
• The Complete Peerage, a reference work on titled aristocracy
• City Pages, an alternative weekly in Minneapolis-Saint Paul

1,2,3,4,5-Pentamethylcyclopentadiene is a cyclic diolefin with the formula C₅Me₅H (Me = CH₃). 1,2,3,4,5-Pentamethylcyclopentadiene is the precursor to the ligand 1,2,3,4,5-pentamethylcyclopentadienyl, which is often denoted as Cp* (to signify the five methyl groups radiating from the periphery of this ligand as in a five-pointed star). In contrast to less substituted cyclopentadiene derivatives, Cp*H is not prone to dimerization.