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Chemical Factors Affecting Respiration Centers01:31

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Related Experiment Video

Updated: Mar 26, 2026

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
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Soft Approaches to CO2 Activation.

Shoubhik Das1, Felix D Bobbink1, Aswin Gopakumar1

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Chimia
|February 5, 2016
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Summary
This summary is machine-generated.

Carbon dioxide (CO2) is a valuable C1 feedstock. Organocatalysts efficiently convert CO2 into carboxylic acids, esters, and methyl groups, advancing carbon capture and utilization research.

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Area of Science:

  • Green Chemistry
  • Catalysis
  • Sustainable Feedstocks

Background:

  • Carbon dioxide (CO2) utilization is crucial for sustainable chemical synthesis.
  • CO2 is an abundant, inexpensive, and renewable C1 feedstock.
  • Carbon capture and storage (CCS) technologies generate CO2 suitable for valorization.

Purpose of the Study:

  • To explore the organocatalytic conversion of CO2 into valuable chemical functionalities.
  • To demonstrate the synthesis of carboxylic acids, esters, formyl, and methyl groups from CO2.
  • To contextualize these findings within the broader field of CO2 capture and valorization.

Main Methods:

  • Organocatalysis for CO2 functionalization.
  • Conversion of CO2 into various organic groups (carboxylic acid, ester, formyl, methyl).
  • Application to diverse organic molecules.

Main Results:

  • Successful organocatalytic transformation of CO2 into target functional groups.
  • Demonstration of CO2 valorization into carboxylic acids and esters.
  • Introduction of formyl and methyl groups onto organic molecules using CO2.

Conclusions:

  • Organocatalysis offers an effective pathway for CO2 valorization.
  • This research contributes to the development of sustainable chemical processes using CO2.
  • Future research should focus on expanding the scope and efficiency of CO2 conversion methods.