Als experimentelle Grundlage für die Diskussion der Substituenteneffekte der Phosphino‐ und der Phosphinylgruppe unter Zuhilfenahme der Molekülorbital‐Theorie werden die Esterverseifung der Benzoesäureester (I) zu (II), die nukleophile aromatische Substitution der Fluorbenzole (III) zu (IV), die nukleophile aliphatische Substitution der Benzylchloride (V) zu (VI) und die Methanolyse der α‐Chloräthylbenzole (VII) zu (VIII) kinetisch untersucht.
Bei der UV‐Bestrahlung des trans,trans‐Naturstoffes (I) entstehen die cis,trans‐ Isomerenpaare (II) und (III), wobei Alkalibehandlung des Isomerenpaares (II) zum cis‐ und trans‐Enoläther (IV) führt.
has been established by investigation of a new photoreaction of polyyne-ene chlorides. The mechanism and the stereochemistry of this reaction have been studied by several model compounds and with tracers.
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