1,2,3,4,5-Pentanpentacarbonsaure ( 4 ) entsteht durch Kondensation von 1,1,2-Athantricarbons5ure-trimethylester ( I ) mit Aconitsaure-trimethylester (2) zum 1,2,2,3,4,S-Pentanhexacarbonsaure-hexamethylester (3) und dessen Verseifung und anschlieaende Behandlung rnit einem sauren Ionenaustauscher $IIz-YH
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