1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Yuliya22 [10]
3 years ago
7

Where would you expect to find the 1H1H NMR signal of (CH3)2Mg(CH3)2Mg relative to the TMS signal

Chemistry
1 answer:
n200080 [17]3 years ago
8 0

Answer:

  • In diethyl ether, (CH₃)₂Mg(CH₃)₂Mg, show peaks at -1.46 and -1.74 ppm, at -100 °C
  • In tetrahydrofuran (THF), monomer (CH₃)₂Mg show peaks at -1.76 and -1.81 ppm, at -60 °C

Explanation:

The 1H NMR signal of (CH₃)₂Mg can be obtained in diethyl ether and tetrahydrofuran. (CH₃)₂Mg tends to polymerize in diethyl ether but mostly remain monomer in tetrahydrofuran. The negative value of chemical shifts shows that the protons of (CH₃)₂Mg are more shielded than the protons of TMS.

In diethyl ether, the structure of (CH₃)₂Mg is predicted in Figure A (attached). The A group in the structure represents the solvent. The chemical shift at -1.46 ppm is associated with protons of the bridging methyl groups while the signal at -1.74 ppm is for the proton of the terminal methyl group.

In THF, the two possible structures of (CH₃)₂Mg are predicted in Figure B (attached).  Chemical shift at -1.76 ppm is associated with unsolvated monomer of (CH₃)₂Mg while the shift at -1.81 refers to the protons of methyl group bonded to the solvated (CH₃)₂Mg. The solvent is represented as Y in the Figure B.

This study is reported by J. Heard in "NMR of organomagnessium compounds".

You might be interested in
How many moles of LiOH are required to make 4.2 liters of a 0.98 M
ASHA 777 [7]

Answer:

4.12 mol  

Explanation:

Given data:

Moles of LiOH  required = ?

Volume of solution = 4.2 L

Molarity of solution = 0.98 M

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

we will calculate the moles from above given formula.

0.98 M = number of moles / 4.2 L

0.98 M × 4.2 L = number of moles

Number of moles = 0.98 M × 4.2 L

Number of moles = 4.12 mol     (M = mol/L)

7 0
3 years ago
Which of the following is an organic compound
mel-nik [20]
An Organic Compound is when Hydrogen and Nitrogen are bonded.

Therefore A is the answer
6 0
3 years ago
Read 2 more answers
Would the following atoms have similar reactivity?
Sergio [31]
I think D, not sure though!
3 0
2 years ago
Read 2 more answers
2NH4Cl(s)+Ba(OH)2⋅8H2O(s)→2NH3(aq)+BaCl2(aq)+10H2O(l) The ΔH for this reaction is 54.8 kJ . How much energy would be absorbed if
irakobra [83]
1) Chemical equation

<span>2NH4Cl(s)+Ba(OH)2⋅8H2O(s)→2NH3(aq)+BaCl2(aq)+10H2O(l)

2) Stoichiometric ratios

2 mol NH4Cl(s) : 54.8 KJ

3) Convert 24.7 g of NH4Cl into number of moles, using the molar mass

molar mass of NH4Cl = 14 g/mol + 4*1 g/mol + 35.5 g/mol = 53.5 g/mol

number of moles = mass in grams / molar mass

number of moles = 24.7 g / 53.5 g/mol = 0.462 moles

4) Use proportions:

2 moles NH4Cl / 54.8 kJ = 0.462 moles / x

=> x = 0.462 moles * 54.8 kJ / 2 moles = 12.7 kJ

Answer: 12.7 kJ
</span>
7 0
3 years ago
WIll give brainliest! : In the following Punnett square, what is the phenotypic percentages of the offspring? From dwarfism slid
e-lub [12.9K]

Answer:

75% will have long legs and 25% will have short legs

Explanation:

5 0
3 years ago
Other questions:
  • Name this compound [TiBr3(NMe3)3]
    7·2 answers
  • Under constant temperature, the volume occupied by a gas varies inversely to the pressure applied. If the gas occupies a volume
    6·1 answer
  • In an experiment, sulfuric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was formed d
    7·1 answer
  • A [ ] property is a characteristic of matter that describes its ability to change into a different substance.
    15·2 answers
  • Earth is in a habitable zone that allows our planet to have liquid water. What is this zone called?
    5·2 answers
  • Write the formulas of the three singly chlorinated isomers formed when 2,2-dimethylbutane reacts with Cl2 in the presence of lig
    7·1 answer
  • Select the properly written and balanced equation for the following chemical reaction: Sodium metal and an aqueous solution of m
    5·1 answer
  • Assuming equal concentrations, arrange these solutions by pH.
    9·1 answer
  • In a fusion reaction, a major problem related to causing the nuclei to fuse into a single nucleus is the
    10·1 answer
  • Why is tate langdon from ahs so hot
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!