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etimología

Qué (quién) es Koch"s reaction - definición

IN GATTERMAN REACTION(A MODIFICATION OF SANDMEYER REACTION) THE CATALYST CU POWDER IN THE PRESENCE OF HALOGEN ACID (HCL OR HBR)

Gattermann–Koch reaction; Gatterman-Koch reaction; Gatterman reaction; Gattermann Koch reaction; Gattermann aldehyde synthesis; Gatterman-Koch; Gatterman-Koch Reaction; Gattermann-Koch reaction; Gattermann formylation; Gattermann–Koch formylation; Gattermann-Koch formylation

Koch snowflake

$A fractal rough surface built from multiple Koch curve iterations$

FRACTAL AND MATHEMATICAL CURVE

Von Koch snowflake; Sphereflake fratal; Von Koch curve; Sphereflake fractal; Koch snowflake curve; Kock snowflake; Von Koch's Snowflake; Koch's Snowflake; Koch's snowflake; Von Koch's snowflake; Koch curve; Koch fractal; Koch Snowflake; Koch curves; Sphereflake; Coke curve; Coke snowflake; Von Koch's curve; Koch's curve; Koch star; Koch antisnowflake; Cross-stitch curve; Triflake; Minkowski island fractal; Minkowski Island fractal; Triadic Koch teragon; Koch island

The Koch snowflake (also known as the Koch curve, Koch star, or Koch island) is a fractal curve and one of the earliest fractals to have been described. It is based on the Koch curve, which appeared in a 1904 paper titled "On a Continuous Curve Without Tangents, Constructible from Elementary Geometry" by the Swedish mathematician Helge von Koch.

https://en.wikipedia.org/wiki/Koch_snowflake

Koch family

AN AMERICAN FAMILY ENGAGED IN BUSINESS

Koch brothers; Koch Brothers; Coke brothers

The Koch family ( ) is an American family engaged in business, best known for their political activities and their control of Koch Industries, the 2nd largest privately owned company in the United States (with 2019 revenues of $115 billion). The family business was started by Fred C.

https://en.wikipedia.org/wiki/Koch_family

Cees Koch (canoeist)

DUTCH CANOEIST

Cornelius Koch; Cees Koch (canoer)

Cornelis "Cees" Koch (born 30 December 1925) is a Dutch sprint canoeist who competed from the late 1940s to the late 1950s. Competing in two Summer Olympics, he earned his best finish of sixth in the K-2 10000 m event at London in 1948.

https://en.wikipedia.org/wiki/Cees_Koch_(canoeist)

Wikipedia

Gattermann reaction

The Gattermann reaction, (also known as the Gattermann formylation and the Gattermann salicylaldehyde synthesis) is a chemical reaction in which aromatic compounds are formylated by a mixture of hydrogen cyanide (HCN) and hydrogen chloride (HCl) in the presence of a Lewis acid catalyst such as AlCl₃. It is named for the German chemist Ludwig Gattermann and is similar to the Friedel–Crafts reaction.

Modifications have shown that it is possible to use sodium cyanide or cyanogen bromide in place of hydrogen cyanide.

The reaction can be simplified by replacing the HCN/AlCl₃ combination with zinc cyanide. Although it is also highly toxic, Zn(CN)₂ is a solid, making it safer to work with than gaseous HCN. The Zn(CN)₂ reacts with the HCl to form the key HCN reactant and Zn(Cl)₂ that serves as the Lewis-acid catalyst in-situ. An example of the Zn(CN)₂ method is the synthesis of mesitaldehyde from mesitylene.

https://en.wikipedia.org/wiki/Gattermann reaction