Alkoxy ring-functionalized phenylcyanoacrylates (PCA) are reported in a variety of applications . Thus, 2-methoxy ring-substituted methyl PCA was used in pyrrolizinone synthesis , as well as in molecular design for linear and nonlinear optical response . 3-Methoxy ring-substituted methyl PCA was employed in diastereoselective syntheses of polysubstituted cyclohexanes and cyclopentenes and in enhancement of the hyperpolarizability of styrene . Propyl PCA with 4-methoxy ring-substitution was used in synthesis of cyanoacrylates and in technology related to antenna dyes . 4-Propoxy ring-substituted propyl PCA was synthesized in MgO-based catalyzed Knoevenagel reaction . -Butoxy phenyl-substituted ethyl PCA was an intermediate in synthesis of 6-amino-4-(4-butoxyphenyl)-3,5-dicyanopyridine-2(1H)-thione , as well as in synthesis of (arylmethylene)cyanothioacetamides . 4-Hexyloxy ring-substituted ethyl PCA was mentioned in preparation of prostaglandin E synthase inhibitors .