摘要
Oxacalixcrowns 1, 2 and 3 were synthesized via reactions of dihydroxyoxacalix[2]arene[2]pyrazine S with ortho-, meta- and para-bis（bromomethyl）benzenes in a 1：1 fashion. The structures and conformations of 1, 2 and 3 were established by a combination of NMR, mass spectroscopies and single crystal X-ray diffraction analysis.
Oxacalixcrowns 1, 2 and 3 were synthesized via reactions of dihydroxyoxacalix[2]arene[2]pyrazine S with ortho-, meta- and para-bis（bromomethyl）benzenes in a 1：1 fashion. The structures and conformations of 1, 2 and 3 were established by a combination of NMR, mass spectroscopies and single crystal X-ray diffraction analysis.
基金
Financial support from the National Natural Science Foundation of China(Nos.21071053,21002031,61078071)
Shanghai Commission for Science and Technology(Nos.10ZR1409700, 09ZR1422500)
"Strategic Priority Research Program"of Chinese Academy of Sciences(No.XDA01020304)are acknowledged
