This article reviews synthetic transformations involving cleavage of a carbon–carbon bond of
a four-membered ring, with a particular focus on the examples reported during the period …

A base-mediated tandem [3+ 2] cycloaddition/ring opening reaction of nitrilimines generated
from arylhydrazonoyl chlorides with arylnitroso compounds has been developed. This …

The Baeyer–Villiger or Beckmann rearrangements are established methods for the cleavage
of ketone derivatives under acidic conditions, proceeding for unsymmetrical precursors …

Lewis acid‐catalyzed ring‐opening reactions of cyclobutanones were mostly achieved
through cleavage of a single C2− C3 bond to deliver cyclic products. Herein, an …

Since 1984, the chemistry of 1, 2-oxazines and their benzo derivatives has been periodically
reviewed in Comprehensive Heterocyclic Chemistry. 1–3 Since the last survey of this topic …

1-Substituted allenylsilanes reacted with 3-alkoxycyclobutanones in the presence of TiCl 4
to afford 8-oxabicyclo [3.2. 1] octan-3-ones stereoselectively. Nucleophilic attack of …

Aromatic amines are compounds that have found widespread use in medicinal applications
and materials science; consequently, their manufacture is one of the fastest-growing sectors …