NEW MATERIAL: A compd. represented by formula I (wherein R1 is a halogenated 1-10C alkyl group or a group represented by formula II or III; m is 1-4; n is 1-3 provided m+n is not higher than 5; o is 1-4; p is 1-10; and X is H or halogen).

EXAMPLE: o-[(2-trifluoromethoxy)-1,1,2-trifluoroethoxy]styrene.

USE: A polymer material, a chromatography carrier material, an optical system material, a resist, an adhesive, etc.

PROCESS: A hydroxyaldehyde represented by formula IV is reacted with a vinyl ether represented by the formula: CF2=CFOR1 in the presence of an inert nonpolar solvent (e.g. acetonitrile) and a base (e.g. Na2CO3) at -100°C to 100°C to give an aldehyde represented by formula V, which is then reacted with a methylene-t-phosphonium halide in the presence of an inert anhydrous nonpolar solvent (e.g. THF) and a base (e.g. Na amide) to give a compod. represented by formula I.