In the case of hydroboration of 2-alkyl-l-propenes, the influence of the alkyl groups on the reactivity is not correctly expressed by the Taft-Ingold relation, when these groups are tertiary. By means of a DARC topological system treatment, a new steric substituent constants £,* scale is elaborated which seems suitable in reac-
Acetoxysulfonylessigsäure acetyliert 2‐Alkyl‐ [(Ia), (Ib)], 1,2‐Dia1kyl‐ [(Ic),(Id)], 2,2‐Dialkyl‐ [(Va), (VIII), (XIII)] und 1,2,2‐Trialkyl‐ethylene [(Vb), (XI)] unter Bildung von α‐ und β‐Enonen [(II), (VI), (IX) und (XIII) bzw. (III), (VII), (X) und (XIV); (Ic) bildet zusätzlich zu (IIc) und (IIIc) die Verbindungen (II) (R1: ‐H; R2: ‐Et) und (III) (R1: ‐H; R2: ‐Et)], die ggf. als Isomerengemische anfallen.
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