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13 C‐ 13 C NMR coupling constants in substituted allylic ion‐pairs of the type occurring in anionic diene polymerization
Author(s) -
Bywater Stanley,
James Worsfold D.,
Black Paul E.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910470116
Subject(s) - chemistry , isoprene , solvation , tetrahydrofuran , adduct , anionic addition polymerization , ether , polymerization , diethyl ether , allylic rearrangement , diene , ion , medicinal chemistry , organic chemistry , solvent , catalysis , copolymer , natural rubber , polymer
13 C‐ 13 C NMR coupling constants have been measured on the 1:1 adduct of tert‐butyllithium and butadiene, a model for the active centres in the anionic polymerization of butadiene. Solutions in three solvents in which solvation and aggregation properties differ were studied, tetrahydrofuran, diethyl ether and benzene. The 2‐methyl‐ substituted analogue, more appropriate for isoprene type systems was also converted to the potassium salt and a comparison was made of the effect of counter ion. Ion‐pair structure is discussed in terms of these measurements.