Search results
Results From The WOW.Com Content Network
You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
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:
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.
RIVERHEAD, N.Y. - Accused Gilgo Beach serial killer Rex Heuermann has been charged with a seventh murder. Heuermann was charged with killing Valerie Mack, a 24-year-old from New Jersey who had ...
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]
The rebel group that led the ouster of Syrian President Bashar al-Assad - Hayat Tahrir al-Sham (HTS) - has long been under United Nations sanctions, which the U.N. special envoy for Syria Geir ...
USF got the win despite being outgained 441-291 and gaining only 1.6 yards per rush. Its biggest plays came on special teams and defense, including a 93-yard kick return touchdown by Ta'Ron Keith ...