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In organic chemistry, a directing group (DG) is a substituent on a molecule or ion that facilitates reactions by interacting with a reagent.The term is usually applied to C–H activation of hydrocarbons, where it is defined as a "coordinating moiety (an 'internal ligand'), which directs a metal catalyst into the proximity of a certain C–H bond."
Halogen substituents are an exception: they are resonance donors (+M). With the exception of the halides, they are meta directing groups. Halides are ortho, para directing groups but unlike most ortho, para directors, halides mildly deactivate the arene. This unusual behavior can be explained by two properties:
Making a saline water solution by dissolving table salt in water.The salt is the solute and the water the solvent. In chemistry, a solution is defined by IUPAC as "A liquid or solid phase containing more than one substance, when for convenience one (or more) substance, which is called the solvent, is treated differently from the other substances, which are called solutes.
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
More than two-thirds of retirees wish they had saved more and on a consistent basis — and half wish they hadn’t waited so long to focus on it, according to a new report.
Rajat Arora (born 23 July 1975) is an Indian screenwriter known for his work in Hindi-language films and television.He is notably known for writing films such as Taxi No. 9211 (2006), Chandni Chowk to China (2009), Once Upon a Time in Mumbaai (2010), [2] The Dirty Picture (2011), [3] Kick (2014), [4] Gabbar Is Back (2015), Azhaar (2016) and Baadshaho (2017). [5]
Rabbits are the seventh most popular pet in the U.S. Whether you own a bunny or want to, you may wonder how long it'll live. Here's a timeline.
MVP odds tighten up. As of Tuesday, Allen was a -500 favorite to win MVP. A week before, he was -1000, which put his implied odds of winning at more than 90%.