Thirty-four different vinyl monomers have been synthesized, based on 10-undecenoic acid, pyrolysis product of castor oil, in 50 to 100-g lots in high purity. These include allyl ethers and esters, vinyl ethers and esters, and acrylic and methacrylic esters, all of which were characterized by their infrared spectra; purity was checked by chromatographic methods. Boiling points, refractive indices, and iodine values of the products have been reported.