Enantiomerically pure 2,2-dibromocyclopropanecarboxylic acids, simple chiral building blocks

Simple chiral building blocks 1-(R)- and 1-(S)-2,2-dibromocyclopropanecarboxylic acids and 2-(R)-bromo-1-(S)-cyclopropanecarboxylic acids and their 1-methyl analogues, have been obtained on a preparatively useful laboratory scale.