A Novel, Short and Repeatable Two-Carbon Ring Expansion Reaction by Thermo-Isomerization: Easy Synthesis of Macrocyclic Ketones
作者:Matthias Nagel、Hans-Jürgen Hansen、Georg Fráter
DOI:10.1055/s-2002-19758
日期:——
A novel two-carbon ring enlargement procedure, in which medium- and large-ring 1-vinylcycloalkanols are thermoisomerized in a flow reactor system at temperatures of 600 °C to about 650 °C, produces the isomeric ring-expanded cycloalkanones directly and efficiently. This two-step ringexpansion protocol can easily be applied several times successively. For e.g., the musk odorant cyclopentadecanone (Exaltone