2s 4r 1 3 5 dichlorophenyl 3 trifluoroacetyl 2 2 tert butyl 4 4 pyrimidin 5 yl benzyl 4 methylimidazolidin 5 one as a light yellow solid mp 168 169 u00b0 c 1 h nmr 400 mhz cdcl 3 for one rotameric isomer u03b49 21 m 1h arh 8 93 s 2h arh 7 42 abq j 8 4 hz 2h arh 7 19 d j 1 6 hz 1h arh 7 09 abq j 8 4 hz 2h arh 6 79 d j 1 6 hz 2h arh 5 72 s 1h nchn 3 37 abq j 14 0 hz 1h arch 2 3 24 abq j 14 0 hz 1h arch 2 2 02 s 3h ch 3 0 75 s 9h c ch 3 1 h nmr 400 mhz cdcl 3 for the second isomer u03b49 21 m 1h arh 8 93 s 2h arh 7 40 abq j 8 4 hz 2h arh 7 27 t j 1 6 hz 1h arh 7 09 abq j 8 4 hz 2h arh 6 93 d j 1 6 hz 2h arh 5 43 s 1h nchn 3 85 abq j 14 0 hz 1h arch 2 3 17 abq j 14 0 hz 1h arch 2 1 99 s 3h ch 3 0 88 s 9h c ch 3 ms m z 564 m anal calcd for c 27 h 25 cl 2 f 3 n 4 o 2 c 57 35 h 4 46 n 9.