Tertiary Carbon Stabilization
Tertiary Carbon Stabilization - Related Videos
09:47
Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
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Cited by 17 •
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We report on a smart application of carbon nanotubes for kinetic stabilization of lipid particles that contain self-assembled nanostructures in their cores. The preparation of lipid particles requires rather low concentrations of carbon nanotubes permitting their use in biomedical applications such as drug delivery.
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Tertiary Healthcare System
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Specialized care provided over an extended period is called tertiary care. Usually, a primary or secondary care physician will refer a patient to tertiary care. A patient's maximum physical and mental function is restored in tertiary care, which is caused due to the impact of a chronic illness or condition. Tertiary care aims to achieve the highest level of functioning possible while managing chronic illness. For example, a patient who falls and fractures their hip will need secondary care to...
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High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels
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Cited by 5 •
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A protocol for fabricating porous, nanostructured yttria-stabilized-zirconia (YSZ) scaffolds at temperatures between 1,000 °C and 1,400 °C is presented.
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
FAQs
Alkyl groups stabilize an electron-deficient carbon center by donating electron density through inductive effects and hyperconjugation. Hyperconjugation allows positive charge to become distributed into neighboring carbon–hydrogen and carbon–carbon bonds rather than remaining concentrated at one carbon. With three carbon substituents contributing these effects, the intermediate becomes more favorable than less substituted alternatives.
Inductive donation and hyperconjugation provide complementary forms of stabilization. Alkyl groups donate electron density through their connection to the electron-deficient center, while hyperconjugation spreads the positive charge into adjacent carbon–hydrogen and carbon–carbon bonds. Together, these effects reduce the unfavorable concentration of positive charge and help explain why tertiary intermediates can form more readily.
The number of carbon substituents affects the relative stability of a carbocation. Tertiary centers receive stabilizing contributions from three alkyl groups, whereas secondary and primary centers have fewer such groups. Consequently, tertiary carbocations are generally more favorable than secondary or primary counterparts, a comparison that helps predict which intermediate is most likely during an organic reaction.
Greater stabilization makes formation of a tertiary carbocation intermediate more favorable, which can influence both reaction rates and the preferred pathway. When a mechanism can proceed through intermediates with different substitution patterns, comparing their stabilization helps explain why one route is favored. This reasoning is especially relevant when interpreting unimolecular substitution and elimination reactions.
A practical analysis begins by locating the carbon center that could bear positive charge and counting the carbon groups attached to it. Chemists then compare the possible intermediates using inductive donation and hyperconjugation. The more stabilized tertiary option may help explain intermediate formation, the favored reaction pathway, and the products observed after the reaction proceeds.
In unimolecular nucleophilic substitution and elimination, the reaction pathway is influenced by the favorability of a carbocation intermediate. Tertiary carbon stabilization can therefore support pathways that pass through such an intermediate and affect whether substitution or elimination becomes prominent. Examining the available carbon centers provides a basis for connecting intermediate stability with the observed reaction outcome.
Product distributions may reflect which carbocation intermediate is most favorable during a reaction. If alternative pathways generate carbon centers with different substitution patterns, stabilization can shift the reaction toward the more favorable intermediate and its associated products. The same comparison provides context for rearrangements, because changes in carbon connectivity may produce an intermediate with greater stabilization.