josephandrews222
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For the most part, the name 'methorphan' refers to a racemic mixture of the D (dextromethorphan) and L (levomethorphan) stereoisomers. where the D isomer rotates plane-polarized light to the right (dextro) while the L isomer rotates said light to the left (levo).In your experience, does Canon have a long history of releasing successor models at lower prices than their predecessors? Particularly when inflation is high?
Meanwhile, I recommend some dextromethorphan for that cough. When the R5II launches at a higher (or at least, not lower) price than the R5, you may want some of the L stereoisomer of the above to dull the pain.
The D & L stereoisomers are said to be enantiomers (stereoisomers that are the same in every way (connectivity-wise) but differ in the way they rotate plane-polarized light, due to the fact that their atoms are arranged differently in space).
A pair of enantiomers are mirror-image isomers that are not superimposable on each other, and are related to each other in the way that your left hand is related to your right hand.
Racemic mixtures contain a 50/50 mix of both D and L molecules and therefore do not rotate plane polarized light.
While there is no L stereoisomer of dextromethorphan; there is an L stereoisomer of methorphan: levomethorphan (the mirror image of dextromethorphan).
Of note here is that while a pair of enantiomers undergo identical chemical reactions with achiral reagents (i.e. generally speaking, those with no stereocenters or plane of symmetry)...living things (including humans) are full of chiral molecules that possess many stereocenters,
Therefore, pairs of enantiomers (the D form and the L form) can react very differently when allowed to react with chiral molecules in our bodies.
Hence, dextromethorphan is found in cough syrup while levomethorphan is considered an opioid and a Schedule II narcotic, and, to my knowledge, has not been marketed in the USA.
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The molecule that goes by the name of thalidomide exists as two stereoisomers, R & S (this is why people hate organic chemistry; R & S are a different way of categorizing a pair of enantiomers...somewhat analogous to D and L).
For thalidomide, the R-isomer is a sedative and the S-isomer is a teratogen; use of thalidomide samples by pregnant women to relieve morning sickness that had both R and S isomers present, resulted in severe birth defects. It is thought by most scientists that the S-isomer was the bad actor in the birth defects.
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