Full Answer
What is an alkynyl group in chemistry?
Alkynyl Group Definition The group obtained by the removal of one hydrogen atom that is linked to a triply bonded carbon atom is called the alkynyl group.
What is alkynyl halide?
A chemical with one or more halogen atoms linked to an alkynyl group is known as an alkynyl halide or haloalkyne. Fluoride, chlorine, bromide, and iodine are examples of halides found in group 17 of the periodic table.
How do you classify halides?
Alkyl halides fall into different classes depending on how the halogen atom is positioned on the chain of carbon atoms. Alkyl halides can be classified as primary, secondary, or tertiary.
What is mono halide?
monohalide (plural monohalides) (chemistry) A salt containing one halide atom per formula.
What are alkenyl halides?
An alkenyl halide or haloalkene is a compound whose molecule has one or more halogen atoms bonded to an alkenyl group.
What is aryl halide in chemistry?
Haloarene or aryl halide is a chemical compound containing arenas, where one or more hydrogen atoms are bonded to the aromatic ring and are replaced with halogens. They are generally denoted by “Ar-X” where 'X' denotes the halogen atom attached and 'Ar' stands for the aryl group.
What is allylic halide?
Allylic halides:- These are the compounds where the halogen group is attached to a hybridised carbon atom next to the carbon which is already in a double bond with another carbon atom. In both S N 1 and S N 2 mechanisms, these halides are reactive.
What is a vinylic halide?
Vinylic halides: These are the compound in which the halogen atom is bonded to a sp2 hybridised carbon atom of a carbon-carbon double bond. In organic chemistry, a vinyl halide is a compound with the formula CH₂=CHX. The term vinyl is often used to describe any alkenyl group.
Six-membered Rings with Two Heteroatoms, and their Fused Carbocyclic Derivatives
B.U.W. Maes, G.L.F. Lemière, in Comprehensive Heterocyclic Chemistry III, 2008
Four-membered Heterocycles together with all Fused Systems containing a Four-membered Heterocyclic Ring
T. Kawashima, J. Kobayashi, in Comprehensive Heterocyclic Chemistry III, 2008
Substituent Groups
Patrick Bazzini, Camille G. Wermuth, in The Practice of Medicinal Chemistry (Fourth Edition), 2008
Six-membered Rings with Three or more Heteroatoms, and their Fused Carbocyclic Derivatives
V.D. Romanenko, J.-M. Sotiropoulos, in Comprehensive Heterocyclic Chemistry III, 2008
Five-membered Rings with One Heteroatom together with their Benzo and other Carbocyclic-fused Derivatives
One of the most versatile routes to siloles, germoles, stannoles, and eventually to plumboles of type 194, allowing for a great variety of substituents in all positions, is provided by 1,1-organoboration of the respective alkyn-1-ylmetal compounds <1995CCR125, 2006HAC188>.
Synthetic Methods II – Chiral Auxiliaries
The complex La- ( R,R )- 341 promoted the Michael reaction of a variety of cyclic enones ( n =0–4) with various malonates to afford Michael adducts with good to excellent ee s (up to >99%), according to Shibasaki and coworkers.
Ring Systems with at least Two Fused Heterocyclic Five- or Six-membered Rings with no Bridgehead Heteroatom
A radical cyclization reaction using a stable radical reagent, 1,1,2,2-tetraphenyldisilane, has been reported to give moderate to good yields of furo [2,3- b ]pyran derivatives (Equation 56) <2000JOC5440>. The cyclization reactions, which are initiated with Et 3 B or AIBN, always produce cis -fused rings.
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Definitions & Translations
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Alkynyl Group Definition
The group obtained by the removal of one hydrogen atom that is linked to a triply bonded carbon atom is called the alkynyl group. This means that an alkynyl group is obtained from an alkyne molecule.
Overview of Alkynyl Group
Alkynyl groups may be defined as the groups whose formation is carried out by removal of terminal hydrogen atom from an alkyne. The groups that have triple bond between the carbon atoms with general formula C n H 2 n − 2 { {\rm {C}}_ {\rm {n}}} { {\rm {H}}_ {2 {\rm {n}} - 2}} Cn H2n−2 are alkynes.
Reactivity and reactions of Alkynyl group
The hydrogen attached to triple carbon on both sides are removable and they undergo substitution reaction. Solution of alkynyl lithium reagents, alkynyl alcohol, and alkynyl ketones are prepared by using Alkynyl group.
Formation of Alkynyl group
As already mentioned, alkynyl groups are mainly obtained through the replacement of terminal hydrogen atoms that are attached to the triply bonded carbon atoms. Formation of some of the alkynyl groups are given in the above-mentioned figure. The terminal hydrogen atoms present in these alkynes are acidic in nature.
Reactions of Terminal alkynyl groups
Sodium alkynides can be prepared from terminal alkynes. This can be obtained by treating a primary alkyl halide with sodium amide and liquid ammonia. The sodium amide can act as a nucleophile that can replace halide ion from the primary alkyl halide. The position of the halogen atom will get occupied by sodium atom and form sodium alkynide.
As adjectives the difference between alkynyl and alkenyl
is that alkynyl is (organic chemistry) of, pertaining to, or derived from an alkyne while alkenyl is (organic chemistry) of, pertaining to, or derived from an alkene.
As nouns the difference between alkynyl and alkenyl
is that alkynyl is (organic chemistry) any univalent radical derived from an alkyne while alkenyl is (organic chemistry) any univalent radical derived from an alkene.
