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2,3-Sigmatropic rearrangements are a type of sigmatropic rearrangements and can be classified into two types. Rearrangements of allylic sulfoxides, amine oxides, selenoxides are neutral. Rearrangements of carbanions of allyl ethers are anionic. [1] The general scheme for this kind of rearrangement is: Atom Y may be sulfur, selenium, or nitrogen.
The Shapiro reaction or tosylhydrazone decomposition is an organic reaction in which a ketone or aldehyde is converted to an alkene through an intermediate hydrazone in the presence of 2 equivalents of organolithium reagent. [1] [2] [3] The reaction was discovered by Robert H. Shapiro in 1967. [4] The Shapiro reaction was used in the Nicolaou ...
dollartree .com. Dollar Tree stores in the U.S., as of December 2020 [4] Dollar Tree, Inc. is an American multi-price-point chain of discount variety stores. Headquartered in Chesapeake, Virginia, it is a Fortune 500 (sometimes referred to as Fortune 200) company and operates 15,115 stores throughout the 48 contiguous U.S. states and Canada. [1]
In December 2017, the Woodbridge Group of Companies (a/k/a Woodbridge Securities) was charged as an alleged US$1.2 billion Ponzi scheme run by real estate developer Robert H. Shapiro (not to be confused with attorney Robert L. Shapiro) by The U.S. Securities and Exchange Commission (SEC).
Backed by $14.2 billion in the 2021 Bipartisan Infrastructure Law, the program discounted high-speed internet service for qualifying households by up to $30 per month ($75 for tribal households ...
Shapiro syndrome is an extremely rare disorder consisting of paroxysmal hypothermia (due to hypothalamic dysfunction of thermoregulation ), hyperhydrosis (sweating), and agenesis of the corpus callosum with onset typically on adulthood. The disease affects about 50 people worldwide. The duration and frequency of the episodes vary from person to ...