Preparation, Structure and Stereodynamics of Phosphorus-Bridged Calixarenes
作者： Oleg Aleksiuk , Flavio Grynszpan , Silvio E. Biali
DOI: 10.1007/BF00708985
关键词:
摘要: The pyrolysis of several dialkylphosphate ester derivatives calix[4]arenes yielded the same phosphorus bridged compound7. Under pyrolytic conditions phosphate groups may be cleaved or intermolecularly transferred. X-ray crystallography calixarenes7 and8 shows that they exist in a chiral ‘flattened cone’ (fc) conformation. calixarenes undergo solution dynamic process with barrier about 10.1 kcal mol−1 for7 and 13.1 for10, respectively. processes result enantiomerization systems. Pyrolysis partially phosphorylated calix[6]arenes resulted formation two products (11 and12), each consisting subunits three proximal rings by group. rotational barriers for11 and12 are 14.4 8.8 mol−1, indicating calix[6]arene system12 is appreciably more flexible than11.
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