6533b856fe1ef96bd12b2fa0
RESEARCH PRODUCT
Schrittweise synthesen und eigenschaften einiger cyclopentamerer aus methylenverbrückten (5-alkyl-2-hydroxy-1,3-phenylen)-bausteinen
Hermann KämmererBernd MathiaschGünter Happelsubject
chemistry.chemical_compoundFragmentation (mass spectrometry)chemistryPentamerPolymer chemistryMelting pointMass spectrumProton NMRPseudorotationMoleculeOligomerdescription
Three cyclopentamers (2a–c) and a chainlike pentanuclear oligomer (3a) were prepared by stepwise syntheses. The molecules of the cyclic compounds with 20 links contain o,o′-methylene bridged 2-hydroxy-5-methyl-1,3-phenylene or 2-hydroxy-5-tert-butyl-1,3-phenylene units in a strictly defined manner. The properties of the cyclic pentamer 2a and the chainlike pentanuclear oligomer 3a were compared. They differ by their solubilities, melting points, IR and 1H NMR spectra (pseudorotation) and fragmentation behaviour shown by their mass spectra. The pseudorotation of the cyclic compounds were quantitatively studied.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1981-06-01 | Die Makromolekulare Chemie |