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Carbon and the Molecular Diversity of Life Chapter 4 PowerPoint Lectures for
Carbon and the Molecular Diversity of Life Chapter 4 PowerPoint Lectures for

... • Most organic compounds contain hydrogen atoms in addition to carbon atoms • Vitalism, the idea that organic compounds arise only in organisms, was disproved when chemists synthesized the compounds • Mechanism is the view that all natural phenomena are governed by physical and chemical laws Copyrig ...
Chapter 14 - "Organic Chemistry"
Chapter 14 - "Organic Chemistry"

Organic-IB-Short-Exam Questions-Answers
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Introduction to Unknowns.
Introduction to Unknowns.

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Atomic Structure - Hudson City School District
Atomic Structure - Hudson City School District

... • Water would not condense from vapor into solid or liquid forms if its molecules didn't attract each other. • Many properties of molecular compounds, including crystal structures (e. g. the shapes of snowflakes), melting points, boiling points, heats of fusion and vaporization, surface tension, and ...
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Click here to Ch 06.2 Covalent Bonding_Lewis Structures

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Study guide - cloudfront.net

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91391 Demonstrate understanding of the properties of organic

... Demonstrate understanding involves naming using IUPAC conventions (no more than eight carbons in the longest chain) and/or drawing structural formulae of organic compounds and giving an account of their physical properties and/or reactivity. This requires the use of chemistry vocabulary, symbols, an ...
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Name - TeacherWeb
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... yourself, “How are they similar? How are they different?” As you read Lesson 23.1, use the compare and contrast table below to differentiate among functional groups. Compound type ...
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Slide 1 In this lesson, we will give you a general

... Let us look at the definition of organic molecules. Organic Molecules are the compounds containing carbon atoms. We do not include Carbon dioxide and diamonds under this category. Early Thoughts were that only living things could synthesize organic compounds. But, in 1800, an organic compound was sy ...
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< 1 ... 115 116 117 118 119 120 121 122 123 ... 171 >

Homoaromaticity



Homoaromaticity in organic chemistry refers to a special case of aromaticity in which conjugation is interrupted by a single sp3 hybridized carbon atom. Although this sp3 center disrupts the continuous overlap of p-orbitals, traditionally thought to be a requirement for aromaticity, considerable thermodynamic stability and many of the spectroscopic, magnetic, and chemical properties associated with aromatic compounds are still observed for such compounds. This formal discontinuity is apparently bridged by p-orbital overlap, maintaining a contiguous cycle of π electrons that is responsible for this preserved chemical stability.The concept of homoaromaticity was pioneered by Saul Winstein in 1959, prompted by his studies of the “tris-homocyclopropenyl” cation. Since the publication of Winstein's paper, much research has been devoted to understanding and classifying these molecules, which represent an additional “class” of aromatic molecules included under the continuously broadening definition of aromaticity. To date, homoaromatic compounds are known to exist as cationic and anionic species, and some studies support the existence of neutral homoaromatic molecules, though these are less common. The 'homotropylium' cation (C8H9+) is perhaps the best studied example of a homoaromatic compound.
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