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Title: Catch and Release: Orbital Symmetry Guided Reaction Dynamics from a Freed “Tension Trapped Transition State”

Journal Article · · Journal of Organic Chemistry
 [1];  [2];  [1];  [2];  [3];  [1]
  1. Duke Univ., Durham, NC (United States). Dept. of Chemistry
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
  3. Stanford Univ., CA (United States). Dept. of Chemistry

The dynamics of reactions at or in the immediate vicinity of transition states are critical to reaction rates and product distributions, but direct experimental probes of those dynamics are rare. In this paper, s-trans, s-trans 1,3-diradicaloid transition states are trapped by tension along the backbone of purely cis-substituted gem-difluorocyclopropanated polybutadiene using the extensional forces generated by pulsed sonication of dilute polymer solutions. Once released, the branching ratio between symmetry-allowed disrotatory ring closing (of which the trapped diradicaloid structure is the transition state) and symmetry-forbidden conrotatory ring closing (whose transition state is nearby) can be inferred. Finally, net conrotatory ring closing occurred in 5.0 ± 0.5% of the released transition states, in excellent agreement with ab initio molecular dynamics simulations.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Stanford Univ., CA (United States); Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE; US Army Research Office (ARO)
Grant/Contract Number:
AC52-07NA27344; W911NF-07-0409
OSTI ID:
1255180
Report Number(s):
LLNL-JRNL-663112
Journal Information:
Journal of Organic Chemistry, Vol. 80, Issue 23; ISSN 0022-3263
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (35)

Chemiluminescence during the course of a reactive encounter; F+Na 2 →FNaNa ‡* →NaF+Na * journal December 1980
Chemiluminescent Reaction Channel Opened by Photon Absorption During Collision journal March 1980
Laser Femtochemistry journal December 1988
Transition State Spectroscopy of Bimolecular Chemical Reactions journal October 1992
Transition-State Spectroscopy of Cyclooctatetraene journal June 1996
Stereochemistry of Electrocyclic Reactions journal January 1965
Covalent Mechanochemistry: Theoretical Concepts and Computational Tools with Applications to Molecular Nanomechanics journal June 2012
Mechanically-Induced Chemical Changes in Polymeric Materials journal November 2009
Mechanochemistry:  The Mechanical Activation of Covalent Bonds journal August 2005
Mechanochemistry: One Bond at a Time journal June 2009
Molecular Stress Relief through a Force-Induced Irreversible Extension in Polymer Contour Length journal November 2010
Biasing reaction pathways with mechanical force journal March 2007
Force-induced activation of covalent bonds in mechanoresponsive polymeric materials journal May 2009
Adsorption-induced scission of carbon–carbon bonds journal March 2006
Trapping a Diradical Transition State by Mechanochemical Polymer Extension journal August 2010
Tension Trapping of Carbonyl Ylides Facilitated by a Change in Polymer Backbone journal May 2012
Reactive Cross-Talk between Adjacent Tension-Trapped Transition States journal March 2011
Experimental Study of the Stereomutation of 1,1-Difluoro-2-ethyl-3-methylcyclopropane Confirms the Predicted Preference for Disrotatory Ring Opening and Closure journal June 1998
Potential surfaces for cyclopropane stereomutations: what a difference geminal fluorines make journal January 1994
Ring-Opening Metathesis Polymerization of Functionalized Cyclooctenes by a Ruthenium-Based Metathesis Catalyst journal August 1995
The mechanism of cavitation-induced polymer scission; experimental and computational verification journal September 2004
gem -Dichlorocyclopropanes as Abundant and Efficient Mechanophores in Polybutadiene Copolymers under Mechanical Stress journal August 2009
Inducing and quantifying forbidden reactivity with single-molecule polymer mechanochemistry journal February 2015
First Principles Dynamics and Minimum Energy Pathways for Mechanochemical Ring Opening of Cyclobutene journal May 2009
Bimodal Distribution of Lifetimes for an Intermediate from a Quasiclassical Dynamics Simulation journal January 1996
Investigation of Cyclopropane Stereomutation by Quasiclassical Trajectories on an Analytical Potential Energy Surface journal June 1997
Activating catalysts with mechanical force journal April 2009
Stress-Responsive Polymers Containing Cyclobutane Core Mechanophores: Reactivity and Mechanistic Insights journal August 2013
“Flex-Activated” Mechanophores: Using Polymer Mechanochemistry To Direct Bond Bending Activation journal May 2013
Model studies of force-dependent kinetics of multi-barrier reactions journal September 2013
A Remote Stereochemical Lever Arm Effect in Polymer Mechanochemistry journal October 2014
NMR nomenclature. Nuclear spin properties and conventions for chemical shifts(IUPAC Recommendations 2001) journal January 2001
Mechanistic Studies on Zinc-Induced Addition of CF2Br2 to Olefins. A Novel Radical Reductive Cyclopropanation on the Zinc Surface journal February 1994
The Complete Active Space Self-Consistent Field Method and its Applications in Electronic Structure Calculations book January 1987
Theoretical Studies of Electronically Excited States of Molecular Systems Using Multiconfigurational Perturbation Theory journal February 1999

Cited By (2)

Force-Induced Catastrophes on Energy Landscapes: Mechanochemical Manipulation of Downhill and Uphill Bifurcations Explains the Ring-Opening Selectivity of Cyclopropanes journal February 2018
Steering chemical reactions with force journal November 2017

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