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- W2029135058 abstract "In p-t-butylcalix[4]arene (1H 4 ) and its mono-, di-, tri-, and tetra-O-alkyl derivatives (1HR 3 , 1H 2 R 2 , 1HR 3 , and 1R 4 respectively), 23 different homologs can exist (including 1H 4 ). We found that the OH group in the unmodified phenol unit is permeable through the calix[4]arene ring. Thus, several conformational isomers become equivalent after the oxygen-through-the-annulus rotation of the OH group and the number of the possible homologs is reduced to 13 (including 1H 4 ). We here report the syntheses of all of these possible conformational isomers by using a protection-deprotection method with a benzyl group and metal template effects. The results are very useful for understanding the conformer distribution in 1H 2 R 2 , 1HR 3 , and 1R 4 , which has confused calixarene chemists for a long time and is still a matter of discussion. All possible conformational isomers of p-t-butylcalix[4]arene and its mono-, di-, tri-, and tetra-O-propyl derivatives have been synthesized by using a protection-deprotection method with a benzyl group and metal template effects." @default.
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- W2029135058 date "1991-01-01" @default.
- W2029135058 modified "2023-09-27" @default.
- W2029135058 title "Syntheses of all possible conformational isomers of O-alkyl-p-t-butylcalix[4]arenes" @default.
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- W2029135058 doi "https://doi.org/10.1016/s0040-4020(01)87102-7" @default.
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