Acrolein is improved as a dienophile in the presence of the K10 montmorillonite exchanged with iron(III). Cycloaddition occurs with a number of dienes at room temperature and in high yield. Dienes tested include butadiene, isoprene, cyclopentadiene, cyclohexadiene, 1-methoxycyclohexadiene, anthracene.
In Gegenwart von Al2O3 bzw. von KF auf Al2O3 lassen sich, vorzugsweise unter Zusatz geringer Mengen Wasser, Wittig‐Reaktionen mit den Phosphoniumsalzen (I) und den Aldehyden (II) ohne Lösungsmittel und ohne weiteren Basenzusatz in guten Ausbeuten durchführen.
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