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- W1570728020 abstract "In this work we have explored the structure directing effect of two of the diastereoisomers of the chiral cation 2-hydroxymethyl-1-benzyl-1-methylpyrrolidinium (bmpm) in aluminosilicate preparations using tetramethylammonium (TMA) as a co-SDA. The pure SS-bmpm isomer, an equimolar mixture of the RS and SS-bmpm isomers and an enriched mixture in the RS isomer (∼77%) were tested in these preparations and the three succeeded in crystallizing a ferrierite-type material with a larger interlayer distance between the FER sheets than in the fully-condensed FER structure. Molecular mechanics calculations showed that the structure directing ability of the RS isomer to direct the crystallization of the fully-condensed FER structure is lower due to the larger molecular size brougth about by the ‘anti’ configuration of the methyl and the hydroxymethyl substituents, thus suggesting a better structure directing efficiency for the SS isomer. However, the large size of the structure directing agent bmpm forces the FER structure to crystallize with a larger interlayer distance between the FER sheets, canceling the difference in the fitting of the diastereoisomers within the zeolite framework and so preventing the observation of a different structure directing efficiency of the two diastereoisomers in the synthesis of the FER materials." @default.
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- W1570728020 date "1973-06-01" @default.
- W1570728020 modified "2023-09-25" @default.
- W1570728020 title "Effect of some material and operating variables on scuffing" @default.
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- W1570728020 doi "https://doi.org/10.1016/0094-114x(73)90055-4" @default.
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