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Stereochemistry question... 2-bromobutane I have a molecule 2-bromobutane CH3CH2CHBrCH3 I'm trying to figure out its optical activity by finding a stereogenic center. What I'm confused about is?
its a stereo isomers because it has on chiral center and free from elements of symmetry
How much chiral carbon does tetracycline have?
The number of chiral center of tetracycline is 5 .. there are 5 chiral carbons.If there is confusion about the 25=32 Remark, the previous writer was using the equation- 2 to the power of n= then the number of possible stereoisomers, where n is the number of stereogenic centers, hence 2 to the power of 5 is 32.
What is meant by absolute configuration?
According to the Internatioinal Union of Pure and Applied Chemistry (IUPAC), every molecule (compound/chemical structure) has to have it's own specific name. Noted: some molecules have a chemical name and a common name, for example, isopropyl alcohol also known as rubbing alcohol, respectively, the chemical name and the common name. Yet, every molecule has to have a specific name, otherwise confusion occurs when two different molecules are named with the same name! In the case of a pair of Enantiomers, of which, is the only case in which Absolute Configuration (RS Configuration) is determined to name two elements (the pair of Enantiomers). Remembering that a pair of Enantioimers only vary in their 3-dimensional spatial arrangement. In order to do this, the Absolute Configuration (RS Configuration) is determined. To determine the Absolute Configuration (RS Configuration), the Stereogenic Carbon (also called a Stereocenter) has to have 4 different elements single bonded to the carbon element (stereogenic carbon). Prioritize the elements using the Cahn, InGold and Prelog (CIP) rules, once that is done you will need to, according to the CIP rules, draw a circle (arrow) from the #1 priority element (group) to the 2nd to the 3rd and take note of which direction the arrow is going, that is, to the right or the left. If the arrow goes to the right it is denoted as R, if it goes to the left it is denoated with an S. One Enantiomer will be R and the other will be S, and assigned to the name of the molecule. Therefore, each Enantiomer of the pair of Enantiomers, has a distinct name using an R or an S. The McLaurin Method describes a method using your hand, arm and three digits to determine the correct configuration of each stereocenter (stereogenic carbon). It is simple to learn and covers more tha 5 different molecular representations with several examples, so the professor or the molecule(s) in question will never fool you on a quiz, exam or final exam, DAT or MCAT. Yet, you will have to learn the CIP rules on your own, I did not discuss how to use the CIP rules on my website, yet how to determine the configuration of a stereocenter. NOTE: The pair of Enantiomers (2 molecules differing by 3-dimensional spatial arrangement), discussed in the chapter on Stereochemistry, only differ by their rotation of plane polarized light. Just because the configuratin is, for example, to the right, denoted by an R, does Not mean it rotates plane polarized light to the right, it may and it may not! Those rotations of light have been pre-determined and are on a chart that you should and would have at your side. Also, if the configuration is to the left, denoated by an S, does Not mean it rotates plane polarized light to the left, it may or it may not! Once again, those rotations of light have been pre-determined. Good Luck with the method I put together, you can do a search for McLaurin Method and you will find it on the first page of search results, and it is straight forward and will be EASY to remember and use throughout your years of learning Stereochemistry, Isomers, Streeoisomers and a pair of Enantiomers PS: Absolute Configuration references the 3-dimensional spatial arrangement of elements in space. The pair of Enantiomers are assymeteric, non-superimposable on it's mirror image and have Chirality and Handedness.
How did Johannes Kepler change the world?
Kepler was a German astronomer. In 1593 he was appointed professor of mathematics at Graz, and about 1596 began writing to Tycho Brahe. About 1600 he moved to Prague to aid him in his work. After Tycho's death in 1601 Kepler became the astronomer to Emperor Rudolf II. In 1612 he became a math teacher at Linz and in 1628 astrologer to Wallenstein. In his book Mysterium in 1596 he proclaimed that 5 kinds of regular polyhedral bodies govern the 5 planetary orbits; and in his Harmonice Mundi Kepler's Third Law that the "square of a planet's periodic time is proportional to the cube of its mean distance from the sun." He tried to find a law for the movement of Mars and in 1609 published his first and second laws which formed the ground work for Newton's discoveries and are the starting point of modern astronomy. He also made many discoveries in optics, physics, and geometry. Johannes Kepler is an mathematician an astronomer and an astrologer
What is a stereogenic center?
Carbon atoms that have four nonidentical substituents are referred to as asymmetric carbon atoms. Asymmetric carbon are specific examples of a stereogenic center.In other words a carbon atom that has four different elements or compounds bonded to its a stereogenic center.
What were the two factions called of world war 2?
Axix and Allies
How do you calculate a gradient of a graph?
Y divided by X axix- Y/X
Which planet takes more time to complete one rotation on its axix than to complete one revolution around the sun?
Venus
Examples of oscillating motion?
A wheel, connecting rotating gears.on the other hand when the earth is move to its own axix
A pair of numbers us to locate a point on a coordinate plane?
A pair of numbers developed by Descartes is called a coordinate pair. It is alphabetical and the horizontal axix is listed first.
Stereochemistry question... 2-bromobutane I have a molecule 2-bromobutane CH3CH2CHBrCH3 I'm trying to figure out its optical activity by finding a stereogenic center. What I'm confused about is?
its a stereo isomers because it has on chiral center and free from elements of symmetry
What were the axix countries during World War 2?
The Axis Powers in WW2 were made up of mainly Germany, Japan and Italy. There were also some minor countries which were Hungary, Romania, Slovak Republic, Bulgaria, Yugoslavia, Croatia and Thailand.
How much chiral carbon does tetracycline have?
The number of chiral center of tetracycline is 5 .. there are 5 chiral carbons.If there is confusion about the 25=32 Remark, the previous writer was using the equation- 2 to the power of n= then the number of possible stereoisomers, where n is the number of stereogenic centers, hence 2 to the power of 5 is 32.
How long time does it take Uranus to rotate around its own axis?
It takes Uranus 17 hours, 14 minutes and 24 seconds to rotate around it's own axix. In other words, a day on Uranus is shorter than a day on Earth.
What is meant by the term Axix Ht?
The term "Axis HT" refers to a supplement which is commonly used by bodybuilders. The supplement claims to enable the user to burn fat and gain increased muscle mass at a quicker rate than usual. The supplement is non-steroidal.
Why did Nike change their logo in its advertising?
Nike has changed its logo as part of what is known as Brand Re-positioning exercise. Everything was redone. Right from T shirts to equipments to accessories. Very recently, axix bank and Hindusthan Unilever would be a close example of doing the same exercise.
