Defining the chirality signal in asymmetric carbon molecules The molecular chirality (stereoisomerism) should not be confused with optical activit...
Defining the chirality signal in asymmetric carbon molecules
The molecular chirality (stereoisomerism) should not be confused with optical activity.
In organic molecules, chirality is often caused by the fact that two possible arrangements can exist around an asymmetric carbon.
The chirality signal in molecules with asymmetric carbons is made as follows: the four groups around the chiral center, that is, the alpha carbon in amino acids, are called by the letters W, X, Y, and Z.
If the W, X, Y sequence is counterclockwise, the compound is an L-isomer.
If the W, X, Y sequence is clockwise, the compound is a D-isomer.
The molecular chirality (stereoisomerism) should not be confused with optical activity.
In organic molecules, chirality is often caused by the fact that two possible arrangements can exist around an asymmetric carbon.
The chirality signal in molecules with asymmetric carbons is made as follows: the four groups around the chiral center, that is, the alpha carbon in amino acids, are called by the letters W, X, Y, and Z.
If the W, X, Y sequence is counterclockwise, the compound is an L-isomer.
If the W, X, Y sequence is clockwise, the compound is a D-isomer.
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Ed 
A questão trata da definição do sinal de quiralidade em moléculas com carbonos assimétricos. Em moléculas orgânicas, a quiralidade é frequentemente causada pelo fato de que duas disposições possíveis podem existir em torno de um carbono assimétrico. O sinal de quiralidade em moléculas com carbonos assimétricos é feito da seguinte forma: os quatro grupos em torno do centro quiral, ou seja, o carbono alfa em aminoácidos, são chamados pelas letras W, X, Y e Z. Se a sequência W, X, Y for no sentido anti-horário, o composto é um isômero L. Se a sequência W, X, Y for no sentido horário, o composto é um isômero D.
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