New synthetic condition in a wide temperature range from 110℃ to 190℃ was employed to crystallize DBA-VPI-5. The phase transformation of the samples prepared
5-(1-Menthyloxy)-2(5-H)-furanone is used as s chiral dipolarophile for thermal asymmetric 1,3-dipolar cycloadditionreaction with C-phenyl-N-phenyl nitrone to gi