Background Information for Alkenes, Alkynes, and Dienes

These are discussed in a section on acid catalysis in organic chemistry.

Nomenclature of Alkenes, Alkynes, and Dienes

will find a place on the bookshelves of advanced undergraduates and postgraduates working in organic synthesis, catalysis, medicinal chemistry and drug discovery. It is also useful for practising researchers who want to refresh and enhance their knowledge of the field.

T1 - Synthesis, structure, and alkyne reactivity of a dimeric (carbene)copper(I) hydride

Oxidation of Alkenes and Alkynes

Very useful method for alkene synthesis as the position of the double bond is known. The first step is formation of a Phosphorus Ylide (a neutral compound with C- and P+).

Grignard reagents and alkyl lithiums are special agents since they can create new C—C bonds.

In addition to compounds that contain one double bond (alkenes) or one triplebond (alkynes), we can also envision compounds with two double bonds (dienes),three double bonds (trienes), or a combination of double and triple bonds.

5)The enolate ions formed on deprotonation can be alkylated and acylated offering useful products.

Internal alkyne synthesis by C-C coupling - Organic chemistry

Thus, in theory, we can transform an alkene into the parent alkane by adding an H2molecule across a C=C double bond. In practice, this reaction only occurs at highpressures in the presence of a suitable catalyst, such as piece of nickel metal.

Categories: CC Bond Formation > Synthesis of internal alkynes

Acyl anion equivalents which exhibit Umpolung (reversed polarity p 907). Two S atoms attached to the same carbon atom of a 1,3-dithiane cause the H atoms to be more acidic (pKa about 32) than normal alkyl C-H.

and internal bromoalkenes with 5 equiv of …

The relationship between alkanes and alkenes can be understood bythinking about the following hypothetical reaction. We start by breaking the bond in an H2molecule so that one of the electrons ends up on each of hydrogen atoms. We do the samething to one of the bonds between the carbon atoms in an alkene. We then allow theunpaired electron on each hydrogen atom to interact with the unpaired electron on a carbonatom to form a new CH bond.

Organic Chemistry Practice Problems at Michigan State …

Carbon not only forms the strong CCsingle bonds found in alkanes, it also forms strong C=C double bonds. Compounds thatcontain C=C double bonds were once known as olefins (literally, "to make anoil") because they were hard to crystallize. (They tend to remain oily liquids whencooled.) These compounds are now called alkenes. The simplest alkene hasthe formula C2H4 and the following Lewis structure.

Organic Chemistry Practice Problems at Michigan State University

Note: the only difference between the Aldol and Claisen reaction is the fate of the tetrahedral intermediate – Claisen expels alkoxide, Aldol alkoxide is protonated.