Starting with phosphonates such as (I) or (IX), cyclopropyl‐substituted γ‐butyrobetaines, e.g. (VIII) or (X), are prepared.

Solidago multiradiata Ait. var. multiradiata liefert neben den bekannten Zimtalkoholestern 1 (1) und 2 (2) und den Acetylenverbindungen 3 (3) und 4 (4) das Isocumarin-Derivat 5. Die Struktur folgt aus der Summenformel (C13H1604) und dem 'H

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Solvent-free Stobbe condensation of furfural1with dimethyl succinate2under anhydrous conditions at room temperature using dry-solid potassium tertiary butoxide gave 3-carbomethoxy, 4-furyl-3-butenoic acid3, which upon methylation followed by Stobbe condensation reaction with different aldehydes and/or ketones under anhydrous conditions at room temperature afforded substituted carbomethoxy acids5a–f. These acid ester products were saponified to the corresponding dicarboxylic acids6a–fwhich are useful in the synthesis of photochromic fulgides.