free radicals - 2023 ARCADIA

Question

Transition-metal catalyzed reactions can involve single-electron transfers to generate these reactive species. For 10 points each:

[10e] Name these reactive species that feature an unpaired electron.

ANSWER: free radicals

[10m] To confirm that a novel reaction involves a radical mechanism, researchers may use this spectroscopic technique to probe for radical species.

ANSWER: electron paramagnetic resonance [or EPR spectroscopy; accept electron spin resonance or ESR]

[10h] A phase-sensitive detector used in EPR spectroscopy performs this operation on the base absorption signal, explaining why common practice in the literature displays this operation of the molecular magnetic susceptibility on the y-axis.

ANSWER: first derivative (with respect to field strength)

<JZ, Chemistry>

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Summary


2023 ARCADIA at UC Berkeley	Premiere	Y	1	10.00	100%	0%	0%
2023 ARCADIA at Carleton University	Premiere	Y	3	3.33	33%	0%	0%
2023 ARCADIA at Duke	Emory, Duke, Yale	Y	3	3.33	33%	0%	0%
2023 ARCADIA at Emory	Emory, Duke, Yale	Y	3	13.33	100%	33%	0%
2023 ARCADIA at Imperial	Imperial	Y	5	10.00	100%	0%	0%
2023 ARCADIA at Maryland	Maryland, Online	Y	3	6.67	67%	0%	0%
2023 ARCADIA at Ohio State	Ohio State, Texas	Y	3	10.00	100%	0%	0%
2023 ARCADIA Online	Maryland, Online	Y	3	16.67	100%	67%	0%
2023 ARCADIA at RIT	Premiere	Y	1	20.00	100%	100%	0%
2023 ARCADIA at Texas	Ohio State, Texas	Y	3	10.00	67%	33%	0%
2023 ARCADIA at WUSTL	Premiere	Y	3	16.67	100%	33%	33%

Data


Stanford A	Berkeley A	10	0	0	10
Ottawa A	McDouble West-Carleton	10	0	0	10
Ottawa B	Waterloo	0	0	0	0
Ottawa C	Toronto Ray of Sun in the Sky	0	0	0	0
James Madison A	Duke	0	0	0	0
NC State	North Carolina A	10	0	0	10
North Carolina B	South Carolina A	0	0	0	0
Georgia Tech D	Georgia Tech B	10	10	0	20
Bristol	Birmingham	10	0	0	10
Durham	Cambridge A	10	0	0	10
Warwick	Cambridge B	10	0	0	10
Imperial A	Oxford	10	0	0	10
Edinburgh	Imperial B	10	0	0	10
George Washington A	George Washington B	10	0	0	10
Georgetown	Maryland B	0	0	0	0
Maryland A	Johns Hopkins	10	0	0	10
Kenyon B	Kenyon A	10	0	0	10
Michigan B	Ohio State A	10	0	0	10
Michigan A	OSU B	10	0	0	10
Zen and the Art of Buzzing	Arizona State	10	10	0	20
Ganon Evans Fan Club	Boston College	10	0	0	10
MSU A and Friend	Farrellmagnetism	10	10	0	20
Cornell R	Cornell MATLAB	10	10	0	20
HCC	Texas C	0	0	0	0
tag magnet: taylor's version	Texas A	10	0	0	10
Texas B	TAMU	10	10	0	20
Missouri A	Squidward Community College	10	0	0	10
SIUE	WUSTL H2O	10	0	0	10
WUSTL XYZ	Missouri B	10	10	10	30
Tennessee A	Georgia B	10	0	0	10
Georgia Tech C	Georgia Tech A	10	0	0	10