17  US 7,649,118 B2  18  The present invention also encompasses the process for  preparing a novel norbornene having a ketone structure rep› resented by:  and the process for preparing a novel norbornene having:  acid halide of the formula  (1)  and thereby the novel nor› bornene compound can be prepared.  Examples of the norbornene derivative  (1)  as a starting  material are preferably:  wherein R $^{3 }$is H or a hydrocarbon group; R:f2 is as defined  above.  Namely, the present invention provides the process for  preparing the above-mentioned various fluorine-containing  norbornenes at high yield by reacting a norbornene having  C=O group which can be easily synthesized at high yield by 25  the Diels-Alder reaction, with a fluoroalkylation agent.  The first of the preparation processes of the present inven› tion relates to the process for preparing the novel fluorine› containing norbornene derivative having a fluorine-contain› ing ketone structure which is represented by the formula (2):  and the like.  According to the preparation process of the present inven› tion, the ketone structure:  corresponding to the fluoroalkylation agent (Rf 1 )  to be  reacted with the norbornene derivative mentioned above as a  starting material can be introduced. Concretely there can be  obtained the following norbornene derivatives.  by reacting the norbornene derivative having carboxylic acid  ester or acid halide which is represented by the formula  (1  ):  with a fluoroalkylation agent.  Namely, the group represented by:  can be introduced by reacting a fluoroalkylation agent (Rf )  in  an amount equivalent to the weight of carboxylic acid ester or  X is selected from alkyl esters such as ----COOCH$_{3}$ ,  ----COOC$_{2}$H$_{5 }$ and ----COOC(CH$_{3}$ ) 3  and acid halides, for  example, --COP, ----COCl and -CO  Br.  RCOOCH3  TCH3,  TCOF, TCOF  COCl  CF3  F  q  c~cm  ClOC  COCl,  F  CF 3  C¥COOCH;  CF3  H  H  H  H  n  R  X  ’X  R  (Y)m\....____/ "-(Z)n  1  H  H  H  H  n  R  X  ’X  R  (Y)m\....____/  "-(X)nl 