This paper describes a paraelectricincommensurate phase t r a n s i t i o n of cholesteryl 2,2 ,3, Stetrafluoropropionate (CTFP 1 found at about -94OC by means of X-ray d i f f r a c t i o n and d i e l e c t r i c constant studies performed with t h e s i n g l e c r y s t a l .