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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:
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]
Caitlin Hale and Angelo Massagli, co-stars from School Of Rock, during their lavish wedding ceremony in New York, 22 years after their iconic movie together.
When necessary, the position of the hydroxyl group is indicated by a number between the alkane name and the -ol: propan-1-ol for CH 3 CH 2 CH 2 OH, propan-2-ol for CH 3 CH(OH)CH 3. If a higher priority group is present (such as an aldehyde , ketone , or carboxylic acid ), then the prefix hydroxy- is used, [ 19 ] e.g., as in 1-hydroxy-2 ...
An American Airlines flight departing New York's LaGuardia Airport on Thursday evening had to divert to nearby John F. Kennedy International shortly after takeoff after a reported bird strike ...
Here's how to pinpoint when you're actually in this phase of life even if your symptoms (hot flashes, mood swings, stress, dryness) are nonspecific.
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.