(a) Interpretation: The Lewis acid and the Lewis base should be identified when ammonia reacts with borane to form ammonia borane. Concept introduction: Lewis acid is a chemical substance which can accept an electron pair and Lewis base is a chemical substance which can donate an electron pair.
(a) Interpretation: The Lewis acid and the Lewis base should be identified when ammonia reacts with borane to form ammonia borane. Concept introduction: Lewis acid is a chemical substance which can accept an electron pair and Lewis base is a chemical substance which can donate an electron pair.
Solution Summary: The author explains that Lewis acid and Lewis base should be identified when ammonia reacts with borane to form a chemical substance.
The Lewis acid and the Lewis base should be identified when ammonia reacts with borane to form ammonia borane.
Concept introduction:
Lewis acid is a chemical substance which can accept an electron pair and Lewis base is a chemical substance which can donate an electron pair.
Interpretation Introduction
(b)
Interpretation:
The electron-dot structure for ammonia borane should be drawn. The hybridization of nitrogen and boron and the bond angles should be given.
Concept introduction:
Compound which have second row elements and hydrogen, the second-row elements are bonded to one another in a central core and hydrogens are on the periphery. Compounds which have more than one second row elements, there may be more than one possible electron-dot structure.
The Concept of Aromaticity
21.15 State the number of 2p orbital electrons in each molecule or ion.
(a)
(b)
(e)
(f)
(c)
(d)
(h)
(i)
DA
(k)
21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the
Hückel criteria? Which, if planar, would be antiaromatic?
21.17 Which of the following structures are considered aromatic according to the Hückel
criteria?
---0-0
(a)
(b)
(c)
(d)
(e)
(h)
H
-H
.8.0-
21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a
heteroatom?
1. Show the steps necessary to make 2-methyl-4-nonene using a
Wittig reaction. Start with triphenylphosphine and an alkyl
halide. After that you may use any other organic or inorganic
reagents.
2. Write in the product of this reaction:
CH3
CH₂
(C6H5)₂CuLi
H₂O+
3. Name this compound properly, including stereochemistry.
H₂C
H3C
CH3
OH
4. Show the step(s) necessary to transform the compound on the
left into the acid on the right.
Bri
CH2
5. Write in the product of this
LiAlH4
Br
H₂C
OH
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