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Rings, formation

Another useful concept is that certain sizes of ring are more easily formed than others. Let us first consider the formation of a six-membered ring. Draw out a six-carbon aliphatic chain in such a manner that the ends are close together. Remember that in an aliphatic carbon the hybridisation is sp, and so the CCC bond angle is about 109°. [Pg.113]

If the hexane chain adopts a shape that is similar to the chair conformation of cyclohexane, it is observed that the terminal carbons are within a normal single bond length of each other. Thus, they are close enough to react with each other to form a bond and so close the ring. [Pg.113]

Now let us look at the formation of a five-membered ring from an aliphatic pentane molecule. Write down a conformation that will allow the terminal carbons to be close to each other. [Pg.113]

if the carbon chain adopts a similar shape to that of cyclopentane, then the terminal carbons would be close enough to react together. [Pg.113]

The assumption so far has been that all bifunctional monomers in step-growth reactions form linear polymers. This is not always true competitive side reactions such as cyclization may occur, as with certain hydroxyacids that may form lactones or lactams if an amino add is used. [Pg.41]


Mannitol, CH,0H(CH0Hi4CH40H, is a hexahydric alcohol obtained by the reduction of mannose. Since ring formation does not occur in mannitol, the hexacetyl derivative can exist in only one form, and therefore either zinc chloride or sodium acetate can be used as a catalyst for the acetylation. [Pg.142]

When ethyl acetoacetate is warmed with an equivalent quantity of phenyl-hydrazine, the compound (I), which is not a true hydrazone, is first formed this undergoes ring formation (II) with loss of ethyl alcohol upon further heating. The product (II) is N or l-phenyl-3-methyl-5-pyrazolone. [Pg.998]


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1.3- dipole formation product ring systems

A Ring Formation by Photocycloaddition to Pyrrolobenzazepines

A-ring formation reaction

Aldehydes seven-ring formation

Amino acid ring formation

Anhydro rings formation

Aromatic compounds ring formation

Associating fluids ring formation

Benzene ring formation

Benzimidazole rings formation

Benzoxazole, ring formation

Bicyclo octanes ring formation

Bicyclo ring systems formation

By Ring Formation

Caprolactam ring formation

Carbon seven-membered ring formation

Carbon-Heteroatom Bond Formation by Rh-Catalyzed Ring-Opening Reactions

Catalytic Formation of Rings Containing the Norbornane Structure

Chelate rings formation

Complex Formation of Aromatic Compounds Containing an Hetero Ring

Crown ethers 18-membered ring formation

Cyclization oxetane ring formation

Cycloaddition five-membered rings formation

Cycloaddition four-membered rings formation

Cycloaddition large rings formation

Cycloadditions three-membered ring formation

Cyclobutanes ring formation

Cyclobutanes, photochemical ring-formation

Cyclodextrins ring formation

Cyclooctachalcogen ring formation

Cyclopropane ring, formation

Cyclopropane ring, formation reductive opening

Deoxyhalogeno, 3,6-anhydro-ring formation preparation

Diequatorial ring formation

Eight-membered ring formation

Electrocyclic reaction ring formation

Epoxide formation and Ring-opening

Epoxides rate of formation by ring-closing reactio

Equilibrium constants ring formation

Ethers oxidative ring-formation

Ethers ring size effects, in formation

Ethylene-oxide ring formation

Factors Influencing Chelate Ring Formation by Au(I)

Five-membered ring formation Subject

Five-membered ring formation solvent effect

Five-membered ring heterocycles formation

Five-membered ring, formation

Formation and Cleavage of the Oxygen Ring in Sugars

Formation and cleavage of three-membered rings

Formation by Five-Membered Ring Systems

Formation by Six-Membered Ring Systems

Formation of Bicyclic Heterocyclic Ring Systems

Formation of Eight-Membered Ring Systems by Annulation

Formation of Five-Membered Rings

Formation of Five-Membered Rings Intramolecular

Formation of Other Ring Systems

Formation of Ring

Formation of Six-Membered (and Larger) Rings

Formation of Small Rings

Formation of Stereogenic Centers inside the Dihydropyrone Ring

Formation of a Four-Membered Ring

Formation of a Four-Membered Ring Oxetanes

Formation of a Three-Membered Ring

Formation of a pyridine ring fused to two octahydroacridine units

Formation of benzo rings

Formation of five-membered rings - 1,3-dipolar cycloaddition reactions

Formation of four-membered rings

Formation of seven-membered ring

Formation of six-membered rings - Diels-Alder reactions

Formation of three-membered rings

Four membered rings, formation using

Four-membered ring formation

Furfural ring formation

Halodeoxy sugars anhydro-ring formation

Hemiketal ring formation

Heterocyclic compounds four-membered ring, formation

Heterocyclic ring formation

Hydrocarbon ring formation

INDEX ring formation

Imidazole ring formation

Indole ring formation

Indolizidine ring formation

Intramolecular ring formation

Ireland-Claisen rearrangement ring formation

Isoxazole and hydroderivative-ring formation

Kinetically Controlled Ring Formation

Lactam, ring formation

Liesegang ring formation

Linear association and ring formation

Linear polymerizations, ring structure formation

Meisenheimer rearrangement l,2]-oxaza ring formation

Monosaccharides ring formation

Name Reactions for Carbocyclic Ring Formations Edited by Jie Jack Li opyright

Name Reactions for Ring Formation

Nano-ring formation

Natural product synthesis four-membered ring formation

Natural product synthesis large ring formations

Nine-membered ring formation

Nucleophilic cyclization ring-formation

Olefin metathesis medium ring formation

Other Five-Membered Ring Formations

Oxygen ring in, formation and cleavage

Phenol ring formation

Phenol ring-alkylated, formation

Phenyl-ring-containing polymers, formation

Photochemical, nano-ring formations in polyoxometalates

Piperidine ring formation

Porphyrin ring system formation

Proline ring formation

Pterins pyrimidine ring formation

Pyrazine ring formation

Pyrazole ring formation

Pyridine ring construction/formation

Pyridine ring formation

Pyrimidine ring formation

Pyrrolidinone rings formation

Quinolines ring formation

Quinolizidine ring formation

Reaction XVIII.—Ring Formation by Elimination of Water from certain Molecules

Reactions Leading to the Formation of Six-Membered Rings

Regioselectivity three-membered ring formation

Ring Formation Involving a Mononitrile Component

Ring Formation and Expansion

Ring Formation vs. Chain Polymerization

Ring Syntheses Involving Formation of Two Bonds Fragments

Ring and Chain Formation

Ring destruction nine-membered rings formation

Ring formation Closing) reaction

Ring formation calixarenes

Ring formation crown ethers

Ring formation cryptands

Ring formation four-heteroatomic rings

Ring formation in step-growth polymerizations

Ring formation palladium®) chloride

Ring formation porphyrins

Ring formation reaction

Ring formation systems

Ring formation three-heteroatomic rings

Ring formation trifluoromethanesulfonate

Ring formation, factors affecting

Ring formation, kinetic control

Ring formation, relative rates

Ring fragmentation, formation

Ring structure formation

Ring structure formation polymerizations

Ring structure formation, computer

Ring-Formation, Effect

Ring-closing step, chelate formation

Section 3-4 Ring formation reactions

Seven membered ring formation

Siloxane rings, formation

Simultaneous Formation of More Than One Ring

Six-membered ring formation

Solute-Solvent Interactions in Ring Formation

Stabilization and Termination of Chain Growth by Ring Formation

Stages ring formation

Step polymerization ring formation

Stereoselectivity three-membered ring formation

Succinimide ring formation

Sugars oxygen ring in, formation and cleavage

Synthesis of isothiazoles by ring-formation

Taxol oxetane ring formation

Terminal alkynes rings, formation

Tetrazole-ring formation

The Mechanism of Anhydro Ring Formation

The formation of macrocycles during ring-opening polymerization

Thietanes photochemical ring formation

Three-bond formation, pyrimidine ring

Three-membered ring formation

Three-membered rings ring formation

Transannular acylation medium ring formation

Tree rings wood formation

Triazole and triazoline-ring formation

Typical Ring Synthesis of a Pyridine Involving Only C-Heteroatom Bond Formation

Typical Ring Synthesis of a Pyrrole Involving Only C-Heteroatom Bond Formation

Vindoline, ring formation

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