Comment on “Nomenclature, Chemical Abstracts Service Numbers, Isomer Enumeration, Ring Strain, and Stereochemistry: What Does Any of This Have to Do with an International Chemical Disarmament and Nonproliferation Treaty?”

2021 ◽  
Vol 98 (4) ◽  
pp. 1465-1467
Author(s):  
Christoph Rücker ◽  
Markus Meringer ◽  
Alfred Wassermann
Keyword(s):  
Isomer Enumeration ◽  
Ring Strain ◽  
Chemical Abstracts Service

Bis(perchlorocatecholato)silane and Heteroleptic Bidonors: Hidden Frustrated Lewis Pairs by Ring Strain

2021 ◽  
Author(s):  
Deborah Hartmann ◽  
Sven Braner ◽  
Lutz Greb
Keyword(s):  
Ammonia Borane ◽  
Frustrated Lewis Pairs ◽  
Ring Strain ◽  
Frustrated Lewis Pair ◽  
Lewis Pairs

Bis(perchlorocatecholato)silane and bidentate N,N- or N,P-heteroleptic donors form hexacoordinated complexes. Depending on the ring strain and hemilability in the adducts, Frustrated Lewis pair reactivity with aldehydes and catalytic ammonia borane...

scholarly journals Efficient Synthesis of Carbovir and Its Congenerviaπ-Allylpalladium Complex Fomation by Ring Strain-Assisted C−N Bond Cleavage

1998 ◽  
Vol 63 (6) ◽  
pp. 2052-2052
Author(s):  
Nobuya Katagiri ◽  
Masahiro Takebayashi ◽  
Chikara Kaneko ◽  
Kouichi Kanehira ◽  
Masahiro Torihara
Keyword(s):  
Bond Cleavage ◽  
Efficient Synthesis ◽  
Ring Strain

Delineating the possibilities for intramolecular interception of the squarate ester cascade through the use of metalated enecarbamates

2000 ◽  
Vol 78 (6) ◽  
pp. 689-696 ◽  
Author(s):  
Jinsung Tae ◽  
Leo A Paquette
Keyword(s):  
Ring Opening ◽  
Membered Ring ◽  
Sequential Treatment ◽  
Nucleophilic Attack ◽  
Ring Strain ◽  
Multistep Process

Highly functionalized and annulated 2,4-cyclooctadienones are formed in a stereoselective manner by sequential treatment of squarate esters with a lithiated enecarbamate (six-membered ring or larger) and a cycloalkenyl- or 1-alkenyllithium reagent. The mechanistic details of this multistep process are presented. Particular attention is drawn to the step that involves intramolecular nucleophilic attack by a proximal oxido anion at the carbamate carbonyl and results in redirection of the cascade. This step is thwarted when five-membered cyclic enecarbamates are employed because of the excessive buildup of ring strain in the associated transition state.Key words: squarate esters, enecarbamates, conrotatory ring opening, intramolecular acylation, alkenyllithium reagents.

History of Abstracting at Chemical Abstracts Service

1980 ◽  
Vol 20 (4) ◽  
pp. 193-201 ◽  
Author(s):  
Dale B. Baker ◽  
Jean W. Horiszny ◽  
Wladyslaw V. Metanomski
Keyword(s):  
History Of ◽  
Chemical Abstracts Service

Contribution of olefinic ring strain to pentacarbonylchromium-cyclooctene bond strengths

1990 ◽  
Vol 9 (3) ◽  
pp. 874-876 ◽  
Author(s):  
Jane K. Klassen ◽  
Gilbert K. Yang
Keyword(s):  
Ring Strain ◽  
Bond Strengths
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