Organic Chemistry:  Mechanistic Patterns - Image pdf with ocr

دانلود کتاب Organic Chemistry: Mechanistic Patterns - Image pdf with ocr

Author: OGILVIE, DESLONGCHAMPS, BROWNING

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Organic chemistry is a science that has existed for less than 200 years. The traditional way to
teach this discipline is based on the laboratory technology for identifYing organic substances that
existed in the eighteenth century, in which chemical tests that detected the presence of particular
functional groups were used to identifY molecular structure. Because of the importance of these
chemical tests, it was natural that classroom instruction would focus on the functional groups that
were the targets of these tests. Although successful, this approach required extensive rote memorization
without understanding. Deep understanding of the discipline therefore required a long
time and considerable experience to acquire.
In the 1930s, the idea of understanding reactivity by considering the movements of electrons,
rather than just atoms, was pioneered. This mechanistic method of analyzing reactivity is a more
general and powerful way of thinking about organic chemistry, making it possible to describe
why a reaction occurred, and to explain many concepts that had previously been derived from
empirical measurement. But ...
Today, textbooks
and courses are
sti ll organized around
the functional group
concept.
Today, textbooks and courses are still organized around
the functional group concept. Mechanisms are taught today,
but typically in the context of the older functional group way
of studying the discipline. Because chemists learn the discipline
according to functionality, they tend to teach the subject
the way they have been taught-grouping by molecular
structure. It is difficult to move beyond this traditional way of
thinking about organic chemistry. We, as educators, tend to
fall back into old patterns, and utilize the functional-groupcentred
approach.
For example, ozonolysis is often taught as part of alkene
reactivity, presenting a complex cycloaddition to students
who are still trying to master the concepts of nucleophile
and electrophile. Texts often compound this challenge by
presenting "magic" reactions where no mechanistic insight is provided. In the case of ozonolysis,
a reducing agent is often shown to magically transform the ozonide into two carbonyl
components, with no understanding of how the process operates.
A mechanistic method is-in principle- more general, easier to understand, and provides
a better way to achieve a deep understanding of chemical reactivity. But a mechanistic method
req uires a mechanistic approach. A curriculum must be organized around reactivity, not structure.

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Ebook details:
عنوان: Organic Chemistry: Mechanistic Patterns With Printed Access Card (12 Months) for ChemWare
نویسنده: OGILVIE, DESLONGCHAMPS, BROWNING
ناشر: Nelson Canada (2017)
زبان: English
شابک: 0176833307, 978-0176833305
حجم: 250 Mb
فرمت: Image pdf with ocr

ادامه ...

ادامه ...
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