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2005
Rings with 7 or more members
Q 0050
The Synthesis of E-2-(Bromomethylene)cyclohexanone and E-2-(Bromomethyl— The synthesis of the title E-2-(bromomethylene)cycloalka30- 059 ene)cycloheptanone.
nones (V) by reacting the corresponding cycloalkanones (I) with ethyl formate (II) and
further treatment of the formed 2-(hydroxymethylene)cycloalkanones (III) with triphenylphosphine, molecular bromine in HMPA, acetonitrile and triethylamine is described. The need for fine tuning the reaction temperature is shown. —
(BANWELL*, M. G.; MA, X.; WILLIS, A. C.; Org. Prep. Proced. Int. 37 (2005) 1,
93-98; Res. Sch. Chem., Aust. Natl. Univ., Canberra, A. C. T. 0200, Australia; Eng.)
— C. Hettrich
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