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 …

N‐heterocyclic carbene (NHC) catalysis has emerged as a powerful strategy in organic
synthesis. In recent years a number of reviews have been published on NHC‐catalyzed …

The principle of vinylogy states that the electronic effects of a functional group in a molecule
are possibly transmitted to a distal position through interposed conjugated multiple bonds …

N-Heterocyclic carbene (NHC) organocatalysis has emerged as a powerful tool in the field
of modern organic synthesis especially in asymmetric construction of various cyclic …

Enzymes are the core for biological transformations in nature. Their structures and functions
have drawn enormous attention from biologists as well as chemists since last century. The …

The enantioselective synthesis of pyrazolone‐fused spirocyclohexadienones was
demonstrated by the reaction of α, β‐unsaturated aldehydes with α‐arylidene pyrazolinones …

N-Heterocyclic carbene (NHC) organocatalysis has been recognized as a powerful synthetic
strategy for the construction of a wide variety of medicinally and biologically important …

The synthetic potential of imines as electrophiles or as a source of nucleophilic coupling
partner in N-heterocyclic carbene (NHC) catalysis for the synthesis of various nitrogen …

The developments of theoretical studies on NHC‐catalyzed [n+ 2](n= 2, 3, 4) and other
cycloaddition/annulation reactions have been summarized in this review. The detailed …

Cyclobutenones, four‐membered ketones bearing an unsaturated carbon–carbon double
bond, and their structural sibling benzocyclobutenones, possess unique reactivity. Owing to …