Regio- and stereoselective dehydrogenation of .alpha.,.omega.-diols catalyzed by a rhodium hydride complex

1986 ◽  
Vol 51 (14) ◽  
pp. 2822-2824 ◽  
Author(s):  
Youichi Ishii ◽  
Katsumi Suzuki ◽  
Takao Ikariya ◽  
Masahiko Saburi ◽  
Sadao Yoshikawa
Keyword(s):  
Hydride Complex ◽  
Alpha Omega

Alpha & Omega of Thinking

1964 ◽  
Vol 9 (5) ◽  
pp. 210-211
Author(s):  
WARD C. HALSTEAD
Keyword(s):  
Alpha Omega

Dual-Function, Light Switchable Cobalt Catalysis via Active Site Metamorphosis

2019 ◽  
Author(s):  
Enrico Bergamaschi ◽  
Frédéric Beltran ◽  
Christopher Teskey
Keyword(s):  
Visible Light ◽  
Active Site ◽  
Catalytic Site ◽  
Dual Function ◽  
Catalytic Systems ◽  
Hydride Complex ◽  
Dual Functional ◽  
Multiple Processes ◽  
Olefin Migration

<p></p><p></p><p>Switchable catalysis offers opportunities to control the rate or selectivity of a reaction <i>via</i> a stimulus such as pH or light. However, few examples of switchable catalytic systems that can facilitate multiple processes exist. Here we report a rare example of such dual-functional, switchable catalysis. Featuring an easily prepared, bench-stable cobalt(I) hydride complex in conjunction with pinacolborane, we can completely alter the reaction outcome between two widely employed transformations – olefin migration and hydroboration – with visible light as the sole trigger. This dichotomy arises from ligand photodissociation which leads to metamorphosis of the active catalytic site, resulting in divergent mechanistic pathways.</p><p></p><p></p>

scholarly journals A comparison of orthopaedic surgery and internal medicine perceptions of USMLE Step 1 pass/fail scoring

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Frederick Mun ◽  
Alyssa R. Scott ◽  
David Cui ◽  
Erik B. Lehman ◽  
Seong Ho Jeong ◽  
...  
Keyword(s):  
Internal Medicine ◽  
Extracurricular Activities ◽  
Residency Program ◽  
Medical Schools ◽  
Program Directors ◽  
Program Director ◽  
Personal Knowledge ◽  
Clinical Knowledge ◽  
Alpha Omega ◽  
Residency Program Directors

Abstract Background United States Medical Licensing Examination Step 1 will transition from numeric grading to pass/fail, sometime after January 2022. The aim of this study was to compare how program directors in orthopaedics and internal medicine perceive a pass/fail Step 1 will impact the residency application process. Methods A 27-item survey was distributed through REDCap to 161 U.S. orthopaedic residency program directors and 548 U.S. internal medicine residency program directors. Program director emails were obtained from the American Medical Association’s Fellowship and Residency Electronic Interactive Database. Results We received 58 (36.0%) orthopaedic and 125 (22.8%) internal medicine program director responses. The majority of both groups disagree with the change to pass/fail, and felt that the decision was not transparent. Both groups believe that the Step 2 Clinical Knowledge exam and clerkship grades will take on more importance. Compared to internal medicine PDs, orthopaedic PDs were significantly more likely to emphasize research, letters of recommendation from known faculty, Alpha Omega Alpha membership, leadership/extracurricular activities, audition elective rotations, and personal knowledge of the applicant. Both groups believe that allopathic students from less prestigious medical schools, osteopathic students, and international medical graduates will be disadvantaged. Orthopaedic and internal medicine program directors agree that medical schools should adopt a graded pre-clinical curriculum, and that there should be a cap on the number of residency applications a student can submit. Conclusion Orthopaedic and internal medicine program directors disagree with the change of Step 1 to pass/fail. They also believe that this transition will make the match process more difficult, and disadvantage students from less highly-regarded medical schools. Both groups will rely more heavily on the Step 2 clinical knowledge exam score, but orthopaedics will place more importance on research, letters of recommendation, Alpha Omega Alpha membership, leadership/extracurricular activities, personal knowledge of the applicant, and audition electives.

Zirconium-Hydride-Catalyzed Transfer Hydrogenation of Quinoline and Indole with Ammonia Borane

2021 ◽  
Author(s):  
Xin Cui ◽  
wei huang ◽  
Lipeng Wu
Keyword(s):  
Ammonia Borane ◽  
Transfer Hydrogenation ◽  
Zirconium Hydride ◽  
Indole Derivatives ◽  
Hydride Complex

Herein, by applying zirconium-hydride complex as the catalyst, the transfer hydrogenation of quinoline and indole derivatives with ammonia borane as the proton and hydride source is achieved. Up to 94%...

Alpha-omega and beyond industrial view of gas/liquid/solid reactor development

1992 ◽  
Vol 47 (13-14) ◽  
pp. 3231-3246 ◽  
Author(s):  
B.L. Tarmy ◽  
C.A. Coulaloglou
Keyword(s):  
Alpha Omega

ChemInform Abstract: ELEKTRONENSPEKTREN UND STRUKTUR VON ALPHA,OMEGA-DIPHENYL-PERFLUORPOLYENEN

1971 ◽  
Vol 2 (11) ◽  
pp. no-no
Author(s):  
YU. P. EGOROV ◽  
V. A. KHRANOVSKII ◽  
V. V. ROSSIKHIN ◽  
N. F. KOVALENKO ◽  
L. M. YAGUPOL'SKII
Keyword(s):  
Alpha Omega

Ketone hydrogenation catalyzed by a new iron(ii)–PNN complex

2016 ◽  
Vol 6 (12) ◽  
pp. 4428-4437 ◽  
Author(s):  
B. Butschke ◽  
M. Feller ◽  
Y. Diskin-Posner ◽  
D. Milstein
Keyword(s):  
Hydride Complex ◽  
Mild Conditions ◽  
Ketone Hydrogenation ◽  
Proton Migration

A dearomatized Fe(ii)–hydride complex mediates the hydrogenation of enolizable ketones under very mild conditions. Deactivation occursviaintramolecular proton migration.

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