Methide ion | chemical compound | Britannica
网页The simplest carbanion, the methide ion (CH-3 ), is derived from the organic compound methane (CH 4) by a loss of a proton (hydrogen ion, H +) as shown in the following chemical equation: Read More
Quinone methide - Wikipedia
网页A quinone methide is a type of conjugated organic compound that contain a cyclohexadiene with a carbonyl and an exocyclic methylidene or extended alkene unit. It is analogous to a quinone, but having one of the double bonded oxygens replaced with a carbon.
The Generation and Reactions of Quinone Methides - PMC
网页2011年1月1日 · Introduction. The 1,2- and 1,4 quinone methides are formally neutral molecules. However, the zwitterionic aromatic valence bond resonance structures (Scheme 1) make an important contribution to their structure.
Quinone-Methide Species, A Gateway to Functional Molecular …
网页2014年9月2日 · Over the last 30 years, the quinone-methide elimination has served as a valuable tool for achieving various important molecular functions.
Methide Definition & Meaning - Merriam-Webster
网页The meaning of METHIDE is a binary compound of methyl usually with a metal. How to use methide in a sentence.
Mild map to quinone methides | Nature Chemistry
网页2020年3月23日 · For over a century, quinone methides (QMs) have been described in organic chemistry as highly reactive intermediates, reacting willingly as Michael-acceptors or dienes in cycloadditions. They can...
Quinone methides and indole imine methides as intermediates in ...
网页2022年6月6日 · As a consequence of their propensity towards aromatization, quinone methides (QMs) and indole imine methides (IIMs) are versatile intermediates in organic synthesis.
Methadone | Uses, Benefits & Side Effects | Britannica
网页2024年9月25日 · methadone, potent synthetic narcotic drug that is the most effective form of treatment for addiction to heroin and other narcotics. Methadone first became available at the end of World War II. Similar to morphine in its analgesic effect, it was originally used in medicine to alleviate severe pain.
What is methamphetamine? | National Institute on Drug Abuse
网页Methamphetamine is a powerful, highly addictive stimulant that affects the central nervous system. It takes the form of a white, odorless, bitter-tasting crystalline powder that easily dissolves in water or alcohol.36,37.
网页Formation and Stability of Simple Quinone Methides. The parent p-quinone methide 1 and its relatives that contain the quinone methide functionality have long attracted the interest of discerning chemists. 1 can be thought of as a formally neutral benzylic carbocation at which there is limiting resonance stabilization by electron donation from a ...