In chemistry, a radical clock is a chemical compound that assists in the indirect methodology to determine the kinetics of a free-radical reaction. The radical-clock compound itself reacts at a known rate, which provides a calibration for determining the rate of another reaction.
Many organic mechanisms involve intermediates that cannot be identified directly but which are inferred from trapping reactions.[1] When such intermediates are radicals, their lifetimes can be deduced from radical clocks.[2][3] An alternative, perhaps more direct approach involves generation and isolation of the intermediates by flash photolysis and pulse radiolysis, but such methods are time-consuming and require expensive equipment. With an indirect approach of radical clocks, one can still obtain relative or absolute rate constants without the need for instruments or equipment beyond those normally needed for the reaction being studied.[4]
^Johnson, C.C.; Lippard, S.J.; Liu, K.E.; Newcomb, M. (1993). "Radical Clock Substrate Probes and Kinetic Isotope Effect Studies of the Hydroxylation of Hydrocarbons by Methane Monooxygenase". J. Am. Chem. Soc. 115 (3): 939–947. doi:10.1021/ja00056a018.
radicalclock is a chemical compound that assists in the indirect methodology to determine the kinetics of a free-radical reaction. The radical-clock...
2009 in a Radical SR8 LM on Dunlop Direzza DZ03 tyres. He clocked a lap time of 6:48:28. A prototype is being made, with the help of Radical Sportscars...
The Prague astronomical clock or Prague Orloj (Czech: Pražský orloj [praʃskiː orloj]) is a medieval astronomical clock attached to the Old Town Hall in...
utilize a radical intermediate but instead acts very quickly via a "radicalclock". In 1998, various researchers showed that grapefruit juice, and grapefruit...
Radical Dreamers is a 1996 text-based visual novel adventure video game developed and published by Square for the Satellaview, a satellite peripheral...
American global watch manufacturing company founded in 1854 as the Waterbury Clock Company in Waterbury, Connecticut. In 1944, the company became insolvent...
(2014). Política Económica Contrarreloj [Economic Politics Against the Clock] (in Spanish). Ediciones Barbarroja. ISBN 978-987-45133-2-8. — (2015). El...
episode. In each show, Loonette performs an exercise routine she calls the Clock Rug Stretch. Other oft-repeated elements include reading a story to Molly...
In gridiron football, clock management is an aspect of game strategy that focuses on the game clock and/or play clock to achieve a desired result, typically...
Rothe, Dawn L.; Collins, Victoria E. (November 17, 2019). "Turning Back the Clock? Violence against Women and the Trump Administration". Victims & Offenders...
II). CRY1 is a circadian photoreceptor whereas CRY2 is a clock repressor which represses Clock/Cycle (Bmal1) complex in insects and vertebrates. In plants...
and electrophiles can be succeeded with free radicals. As with the free-radical substitution, the radical addition proceeds as a chain reaction, and such...
John T. (May 2002). "Revisiting the Mechanism of P450 Enzymes with the RadicalClocks Norcarane and Spiro[2,5]octane". Journal of the American Chemical Society...
with her languorous croons over molasses-like arrangements meant to make clock hands seem to move so slowly that it feels possible, at times, they might...
own short-lived political platforms – the Radical Economic Transformation Movement (RETMO) and African Radical Economic Transformation Alliance (ARETA)...
(April 12, 2014). "Director James Cameron on Vegan Diet: Like I've Set the Clock Back 15 Years". Ecorazzi.com. Archived from the original on September 29...
Ryan N.; Witt, Collin H.; Woerpel, K. A. (2024). "Preparation of a RadicalClocks Bearing Carbonyl Groups: Synthesis of N-Methoxy-N-methylspiro[cyclopropane-1...
Deuterium has been shown to lengthen the period of oscillation of the circadian clock when dosed in rats, hamsters, and Gonyaulax dinoflagellates. In rats, chronic...
workouts, and new "Smart Stacks", stacks of widgets available from the clock. In watchOS 1, third-party WatchKit applications run in the background on...
Stakelbeck has also been noted as an investigative reporter and author on radical Islam, and is TBN's news director. Stakelbeck had a working-class upbringing...
Penguin Specials with the publication of Edgar Mowrer's Germany Puts the Clock Back. Their purpose was to offer in-depth analysis of current affairs that...
2017). "Fox News host Jeanine Pirro hit with speeding charges after cops clock her driving 119 mph upstate". New York Daily News. Retrieved April 4, 2019...
story behind the Solar Noon Clock Wilensky, Joe (August 29, 2011). "Cornell Chronicle: Bill Nye '77 dedicates Solar Noon Clock". News.cornell.edu. Retrieved...
the highest clock speed to be the best product, and the Pentium 4 had the fastest clock speed. Because AMD's processors had slower clock speeds, it countered...
a set of oscillatory genes that direct the somitogenesis clock. The snake somitogenesis clock operates at a frequency 4 times that of a mouse (after correction...
medieval astronomical clock mounted on the Old Town Hall. The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and...
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