The development of new strategies and chemical reactions continues to be a major focus of
research efforts in the modern synthetic organic community. 1 Of the various types of …

Reactive intermediates as recognized chemical entities date back for over a century, and
among the earliest examples were simple free radicals, as identified in 1879, when it was …

Transition-metal-catalyzed [4+ 1] reaction of dienes and carbon monoxide (CO) is the most
straightforward and easily envisioned cyclization for the synthesis of five-membered …

Abstract Spiro [4, 5] decanes and polycyclic compounds bearing spiro [4, 5] decane systems
are important biofunctional molecules. Described are diastereoselective formal (4+ 1) …

A novel formal [4+ 1]-cycloaddition of readily available homopropargyl alcohols with diazo
dicarbonyl compounds is described, which involves tandem O–H insertion/Conia-ene …

Transition metal-catalyzed [4+ 2+ 1] cycloaddition of in situ generated ene/yne–ene–allenes
(from ene/yne–ene propargyl esters) and carbon monoxide (CO) gives the [4+ 2+ 1] …

Reported herein is the first rhodium‐catalyzed [4+ 2+ 1] cycloaddition of in situ generated
ene/yne‐ene‐allenes and CO to synthesize challenging seven‐membered carbocycles …

Rhodium-catalyzed cyclocarbonylation reactions, which include the Pauson–Khand-type or
[2+ 2+ 1] reactions, represent a powerful strategy for the synthesis of cyclic ketones through …

It is the aim of this microreview to highlight the diversity of structural conversions that are
accessible from 1‐alkenylpropargyl alcohols and esters in the context of transition‐metal …

Summary This Chapter Contains Sections titled: 2+ 2‐Cycloaddition 2+ 3‐Cycloaddition 2+
4‐Cycloaddition Miscellaneous References Tetrafluorothiophene S, S‐dioxide is a potent …