2-methyl-3-(3-methylphenyl)acrylic acid

The crystal structure of the title compound, C11H12O2, consists of dimers which are formed due to intermolecular O-H center dot center dot center dot O hydrogen bonding. The dimers are linked to each other by C-H center dot center dot center dot O hydrogen bonds, where C-H belongs to the benzene ring and the O atom is of a carbonyl group of an adjoining molecule. There exist two intermolecular C-H center dot center dot center dot O hydrogen bonds which form five-membered rings. There exist two pi-pi interactions between the benzene rings. The perpendicular distance in these interactions are 3.006 and 3.396 angstrom. There also exist C-H center dot center dot center dot pi and C-O center dot center dot center dot pi interactions.