2.5. 5 Reaction of Formaldehyde with Organometallic Reagents
Book
Editor: van Leeuwen, P. W. N. M.
Title: C-1 Building Blocks in Organic Synthesis 2
Subtitle: Alkenations, Cross Couplings, Insertions, Substitutions, and Halomethylations
Print ISBN: 9783131751218; Online ISBN: 9783132064515; Book DOI: 10.1055/b-003-125817
1st edition © 2014. Thieme. All rights reserved.
Georg Thieme Verlag KG, Stuttgart
Subjects: C-1 Building Blocks in Organic Synthesis
Science of Synthesis Reference Libraries
Parent publication
Title: Science of Synthesis
DOI: 10.1055/b-00000101
Type: Multivolume Edition
Abstract
Formaldehyde is one of the most important single-carbon electrophiles; it is inexpensive and can be used in many organic reactions and thus in natural product synthesis. However, there are scant examples of the application of formaldehyde with organometallic reagents in synthesis. This may be due to the properties of formaldehyde. Monomeric formaldehyde tends to polymerize rapidly to give poorly reactive species such as paraformaldehyde and the trimer trioxane. Paraformaldehyde and trioxane are depolymerized thermally; however, thermal cracking produces highly toxic, gaseous formaldehyde that rapidly repolymerizes. Alternatively, paraformaldehyde and trioxane can be depolymerized with Lewis acids, but this introduces new factors, such as corrosion, toxic waste disposal, and difficult handling. Formaldehyde is also available as an aqueous solution, known as formalin, but this approach is often unsuitable due to the instability of the organometallic compounds in the presence of water. This section discusses all that can be achieved despite these factors.
Key words
formaldehyde - hydroxymethylation - aldol reaction - Prins reaction - carbonyl-ene reaction - hydroformylation - hydrohydroxymethylation-
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