Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Ring medium

Cyclopropanes can also be obtained by the reaction of vinyltrialkylborates with aldehydes followed by treatment with phosphoms pentachloride and base (300), and by the rearrangement of 5-substituted alkynyltrialkylborates (308). It is also possible to utilize this approach for the synthesis of five- and six-membered rings (3). Trans-1,4-elimination ia cycHc systems leads to the formation of stereodefined acycHc 1,5-dienes or medium-ring dienes, depending on the starting compound (309). [Pg.317]

The racemization of medium-ring trans-cycloalkenes depends upon ring size and substitution, as indicated by the data below. Discuss these relative reactivities in terms of the structures of the cycloalkenes and the mechanism of racemization. [Pg.116]

Rearrangements are also observed during halojluonnanons with cyclic medium ring dienes [70, 93] (equations 4 and 5) and with the monoepoxide of 1,5-cyclooctadiene [94] (equation 6) during halofluonnations Again, there are differences in product mixture with apparently minor variations in reagents (equation 4)... [Pg.63]

Extension of these studies to medium rings produced interesting results (73). The mercuric acetate oxidation of 1-methyl-1-azacyclooctane (64), when worked up in the usual manner, gave no distillable material. When an equivalent amount of hydrochloric acid was added to the solution which had been saturated with hydrogen sulfide to precipitate the excess mercuric acetate and filtered, evaporation of the solution to dryness gave a solid which was subsequently identified as 2,4,6-tris(6 -methylaminohexyl)-trithiane trihydrochloride (65). Two plausible routes to the observed... [Pg.72]

This method provides a route to certain medium-ring sized enamines (106,107) not obtainable by other methods, l-Methyl-2-phenyl-l-azacyclo-hcpt-2-ene (124) can be prepared by the reaction of N-methylcaprolactam... [Pg.83]

Figure 4.3 Cycloalkane strain energies, calculated by taking the difference between cycloalkane heat of combustion per CH2 and acyclic alkane heat of combustion per CH2, and multiplying by the number of CH2 units in a ring. Small and medium rings are strained, but cyclohexane rings are strain-free. Figure 4.3 Cycloalkane strain energies, calculated by taking the difference between cycloalkane heat of combustion per CH2 and acyclic alkane heat of combustion per CH2, and multiplying by the number of CH2 units in a ring. Small and medium rings are strained, but cyclohexane rings are strain-free.
The assembly of medium-ring ethers using C-0 or C-C bond forming protocols can be a profitable enterprise 13 nevertheless, it was of interest to determine if medium-ring ethers could be derived... [Pg.744]


See other pages where Ring medium is mentioned: [Pg.146]    [Pg.200]    [Pg.267]    [Pg.126]    [Pg.114]    [Pg.216]    [Pg.480]    [Pg.481]    [Pg.597]    [Pg.667]    [Pg.735]    [Pg.735]    [Pg.735]    [Pg.745]    [Pg.745]    [Pg.794]    [Pg.509]    [Pg.510]    [Pg.512]    [Pg.514]    [Pg.516]    [Pg.518]    [Pg.520]    [Pg.522]    [Pg.524]    [Pg.526]    [Pg.528]    [Pg.530]    [Pg.532]    [Pg.534]    [Pg.536]    [Pg.538]    [Pg.540]    [Pg.542]    [Pg.544]    [Pg.546]    [Pg.548]    [Pg.550]    [Pg.552]    [Pg.554]    [Pg.556]    [Pg.558]    [Pg.560]    [Pg.562]   
See also in sourсe #XX -- [ Pg.151 , Pg.163 ]

See also in sourсe #XX -- [ Pg.226 , Pg.227 , Pg.238 , Pg.239 ]




SEARCH



1.5- Dienes medium rings

Alkene metathesis medium rings synthesis

Amines medium ring size

Asymmetric Synthesis with Medium-Sized Rings

Carbocycles medium ring size

Carbocyclic synthesis medium-sized-ring

Conformation medium and large rings

Cyclic acetylenes medium-ring

Cycloalkane rings Medium

Diastereoselective medium-sized ring

Green synthetic approach medium ring-sized heterocycles

Hydrocarbons medium-sized rings

Isomerization medium-sized rings

Lactams medium ring

Lactones medium-sized ring

Medium 5-Membered ring

Medium Size (Seven- to Nine-Membered Rings)

Medium and large rings

Medium ring ether

Medium ring ethers synthesis

Medium ring lactones

Medium ring size heterocycles fused with

Medium ring-sized heterocycles

Medium rings, definition

Medium rings, reviews

Medium rings, transannular interactions

Medium size ring

Medium- and Large-ring Compounds

Medium- and large-ring lactones

Medium-ring acetylenes

Medium-ring carbocycles

Medium-ring heterocycles

Medium-ring-containing biaryls

Medium-sized ring lactone

Medium-sized rings

Medium-sized rings, diastereoselectivity

Medium-sized-ring Carbocyclic Compounds

Medium-sized-ring Nitrogen-containing Heterocycles

Medium-sized-ring Oxygen-containing Heterocycles

Nitrogen-containing medium-sized ring

Nucleophilic imidazole ring medium

Olefin metathesis medium ring formation

Oxygen-containing medium-sized-ring

Preparation and Properties of Strained Medium-ring Systems

Rings small, medium and large, definitions

Seven-membered, Medium, and Large Rings

Strain in medium rings

Synthesis medium rings

Transannular acylation medium ring formation

Transition structures medium-sized rings

© 2024 chempedia.info