High Rates of Quinone-Alkyne Cycloaddition Reactions are Dictated by Entropic Factors

13 January 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Reaction rates of strained cycloalkynes and cycloalkenes with 1,2-quinones were quantified by stopped flow UV-Vis spectroscopy. Surprisingly, it was determined that 8-membered BCN-OH reacts substantially (16 times) faster than the more strained 7-membered THS. Thermodynamic activation parameters, obtained from the linearized Eyring equation and stopped-flow measurements, revealed that the reaction of both BCN-OH and THS with ortho-quinones is entropycontrolled, ruling out a relevant contribution of secondary orbital interactions (SOIs) as earlier proposed.

Keywords

click chemistry
Eyring plot
secondary orbital interactions

Supplementary materials

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Title
Supporting Information for High Rates of Quinone-Alkyne Cycloaddition Reactions are Dictated by Entropic Factors
Description
Details on the synthesis and characterization of THS 2 and carbamate derivatives 4 and 6, the setup used for the stopped-flow experiments, data on all kinetic measurements, derivatization of mathematical equations and specifics of the computational studies.
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