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(Upper half) ESI mass spectra of the preferentially formed products. (Lower half) Proposed coupling types (formed bonds blue) consistent with the 1H-NMR and FTIR data shown using exemplary dimers (D) trimers (T): Coupling of the vinyl with the diol functionality (D1 + T1). Coupling via the π-system (D2 + T2 also possible at the red marked positions exemplary first monomeric unit T2). Coupling via a condensation mechanism (D3 + T3).
