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Ring strain results from a combination of angle strain, conformational strain or Pitzer strain (torsional eclipsing interactions), and transannular strain, also known as van der Waals strain or Prelog strain. The simplest examples of angle strain are small cycloalkanes such as cyclopropane and cyclobutane.
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Cyclopropane is the cycloalkane with the molecular formula (CH 2) 3, consisting of three methylene groups (CH 2) linked to each other to form a triangular ring. The small size of the ring creates substantial ring strain in the structure.
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This is an accepted version of this page This is the latest accepted revision, reviewed on 18 January 2025. This is a list of cannabis seed companies. Some of these supply only hempseed, that is, cultivars that produce low levels of THC (allowable levels are determined by local regulation). BSF Seeds Coopérative Centrale Des Producteurs De Semences De Chanvre, France, is the main supplier of ...
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The small cycloalkanes – in particular, cyclopropane – have a lower stability due to Baeyer strain and ring strain. They react similarly to alkenes, though they do not react in electrophilic addition, but in nucleophilic aliphatic substitution. These reactions are ring-opening reactions or ring-cleavage reactions of alkyl cycloalkanes.
Because of the large ring strain energy of cyclopropanes (29.0 kcal per mole), they are often used as substrates for C-C activation through oxidative addition of a transition metal into one of the three C-C bonds leading to a metallacyclobutane intermediate. Substituents on the cyclopropane affect the course of its activation. [3]