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• W2006041024 endingPage "2108" @default.
• W2006041024 startingPage "2083" @default.
• W2006041024 abstract "The conformational effects of the quaternary centre in (RCH2CH2)4Xq species are studied by molecular mechanics calculations on hydrocarbons, ammonium ions, and related species, and the results verified by data on quaternary ammonium ions from the Cambridge Structural Database. Prn4C and Prn4N+ have just two low-energy structures, with D2d or S4 symmetry. All other conformations suffer from g+g– non-bonding interactions and will be populated to the extent of <5% at ambient temperatures. These non-bonding interactions affect both the inner torsion angles, CH2–CH2–Xq–CH2 and the next set of torsions, -CH2–CH2–CH2–Xq, but the third set of torsions away from the quaternary centre is unaffected. Two competitive mechanisms for interconversion of the D2d and S4 conformations are proposed on the basis of molecular mechanics calculations. Polymers [(RCH2CH2)2C(CH2)2]n and [(RCH2CH2)2C(CH2)3]n are strain-free with controlled conformations for the -(CH2)2- and -(CH2)3- segments. In polymers containing simple alkyl side chains, there are two energetically similar conformations associated with the D2d local structure which have aaaa and ag±g±a torsion angle sequences for the polymer chain, and two comparable sequences ag±aa and ag±g±a associated with S4 local symmetry. Poly[(1,1-di-R)butane-1,4-diyl]s (R = Et, Pr, Bu and PhCH2CH2) have been prepared by ring opening metathesis polymerisation of 3,3-dialkylcyclobutenes, followed by diimide reduction, and their physical properties are in accord with these predictions. More highly structured side groups can act as extra conformational control elements, and the preparation of monomers and some polymers with these extra features is reported. Planar aromatic side groups like fluorene favour aaaa conformations, cyclohexyl side groups disfavour aaaa, but do not strongly discriminate between ag±aa and ag±g±a, adamantane side groups strongly favour ag±g±a, and a chiral ag+aa sequence is favoured for a polymer from (1R,2R,5R,7R)-2,8,8-trimethyltricyclo[5.1.1.02,5]non-3-ene, itself derived from α-pinene. Studies directed at preparing some structurally-related ketal polymers and a potential covalent ketal network are also described." @default.
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• W2006041024 date "1998-01-01" @default.
• W2006041024 modified "2023-10-09" @default.
• W2006041024 title "Conformational control by quaternary centres: theory, database evidence and application to polymers" @default.
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• W2006041024 cites W1967045812 @default.
• W2006041024 cites W1969006144 @default.
• W2006041024 cites W1972126468 @default.
• W2006041024 cites W1974266733 @default.
• W2006041024 cites W1975397361 @default.
• W2006041024 cites W1975399090 @default.
• W2006041024 cites W1975761956 @default.
• W2006041024 cites W1977464439 @default.
• W2006041024 cites W1980671285 @default.
• W2006041024 cites W1981287002 @default.
• W2006041024 cites W1981861868 @default.
• W2006041024 cites W1983512494 @default.
• W2006041024 cites W1984890384 @default.
• W2006041024 cites W1987830671 @default.
• W2006041024 cites W1990566250 @default.
• W2006041024 cites W1993008721 @default.
• W2006041024 cites W1995726113 @default.
• W2006041024 cites W2006116157 @default.
• W2006041024 cites W2007618885 @default.
• W2006041024 cites W2008865284 @default.
• W2006041024 cites W2014637311 @default.
• W2006041024 cites W2016878413 @default.
• W2006041024 cites W2019709898 @default.
• W2006041024 cites W2020247519 @default.
• W2006041024 cites W2023746075 @default.
• W2006041024 cites W2027329654 @default.
• W2006041024 cites W2027959870 @default.
• W2006041024 cites W2028175105 @default.
• W2006041024 cites W2030685731 @default.
• W2006041024 cites W2039337052 @default.
• W2006041024 cites W2042767439 @default.
• W2006041024 cites W2045960153 @default.
• W2006041024 cites W2046590625 @default.
• W2006041024 cites W2051707493 @default.
• W2006041024 cites W2053333781 @default.
• W2006041024 cites W2053742032 @default.
• W2006041024 cites W2054906303 @default.
• W2006041024 cites W2055928609 @default.
• W2006041024 cites W2060670693 @default.
• W2006041024 cites W2061867547 @default.
• W2006041024 cites W2064919532 @default.
• W2006041024 cites W2065389514 @default.
• W2006041024 cites W2077098168 @default.
• W2006041024 cites W2081405235 @default.
• W2006041024 cites W2083775472 @default.
• W2006041024 cites W2085796412 @default.
• W2006041024 cites W2085841440 @default.
• W2006041024 cites W2088692793 @default.
• W2006041024 cites W2089526089 @default.
• W2006041024 cites W2089839735 @default.
• W2006041024 cites W2312753781 @default.
• W2006041024 cites W2320795357 @default.
• W2006041024 cites W2321022041 @default.
• W2006041024 cites W2332702895 @default.
• W2006041024 cites W2950141462 @default.
• W2006041024 cites W2951345652 @default.
• W2006041024 cites W2952116212 @default.
• W2006041024 cites W2952389699 @default.
• W2006041024 cites W1997547007 @default.
• W2006041024 cites W2318117752 @default.
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• W2006041024 doi "https://doi.org/10.1039/a802623h" @default.
• W2006041024 hasPublicationYear "1998" @default.
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