The Wittig reaction has become a popular method for alkene synthesis precisely because of its wide applicability. Unlike elimination reactions (such as dehydrohalogenation of alkyl halides), which produce mixtures of alkene regioisomers determined by Saytzeff's rule, the Wittig reaction forms the double bond in one position with no ambiguity.
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For a advantage over athlete's and to remain competitive with those who did which it turned out many did.
The living have the advantage over the dead so this one goes easily to Neil Young.
It means taking advantage of a person or a situation. For example, having a job that you feel requires little more than showing up and yet getting paid to do it. One might feel that they are "getting over" on their employer. Be advised, getting over is usually regarded negatively.
A tower fan has a few advantages over regular fans. The most obvious one is the size. A tower fan is tall and slim, hence the name. A regular fan is much bulkier and harder to place in a room. A tower fan will not be knocked over as easily, and if it is knocked over, it is of little worry since the blades are enclosed.