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- W2019931724 abstract "A novel and short method for the synthesis of macrocyclic alkanones has been developed: medium- and large-ring 1-vinylcycloalkanols can be transformed directly and efficiently into the isomeric, ring-expanded bishomologous macrocyclic ketones by a thermal 1,3-C shift rearrangement reaction in the gas phase, carried out under dynamic conditions in a flow reactor system at high temperatures. This two-carbon ring enlargement protocol involves only two steps and is easily repeatable, since the obtained cyclic ketones can directly be used as starting materials for the subsequent analogous two-carbon ring insertion reactions. Alkyl substituents at the vinylic side chain are transferred to the ring-expanded ketone as corresponding ?- and ?-substituents, respectively. Therefore, this thermo-isomerization process provides not only a short route to cycloalkanones but also to many alkyl-substituted macrocyclic ketones, such as, e.g. the musk odorant (±)-muscone. A reaction mechanism via alkyl hydroxyallyl biradical intermediates is proposed." @default.
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- W2019931724 date "2003-04-01" @default.
- W2019931724 modified "2023-09-27" @default.
- W2019931724 title "Synthesis of Macrocyclic Ketones by Repeatable Two-Carbon Ring Expansion Reactions" @default.
- W2019931724 doi "https://doi.org/10.2533/000942903777679398" @default.
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