A method for chemically modifying the internal region of a hair shaft. The method comprises applying an oxidising formulation to the hair de-wetting the hair applying a monomer composition to the hair, wherein the monomer composition comprises an ethylenic monomer having a molecular weight of 500 g/mole or less and a cosmetically acceptable carrier. Also a kit which comprises: application instructions comprising the method and the monomer composition. A method for chemically modifying the internal region of a hair shaft. The method comprises applying an oxidising formulation to the hair de-wetting the hair applying a monomer composition to the hair, wherein the monomer composition comprises an ethylenic monomer having a molecular weight of 500 g/mole or less and a cosmetically acceptable carrier. Also a kit which comprises: application instructions comprising the method and the monomer composition. Compounds represented by Formula I are provided that include synthetic transtaganolide and basiliolide products. Derivatives of these compounds and methods of synthesis are also provided.Un método para modificar químicamente la región interna del tallo del cabello. El método comprende aplicar una fórmula oxidante al cabello eliminar la humedad del cabello aplicar una composición monomérica al cabello, en donde la composición monomérica comprende un monómero etilénico que tiene un peso molecular de 500 g/mol o menor y un portador cosméticamente aceptable. Además, un estuche que comprende: instrucciones de aplicación que comprenden el método y la composición monomérica.
