Synthesis and Properties of 3-Acylmethylene-Z-(Z-hydr0xy-I-alkenyl)-lpheny| eycl0pr0penes ‚a New (Ilass of Stabilized Triafulvenes Triavulvcnes nf type 9 arc obtaincd by reactimt 01" dichlortitjplieiiyt)-cyclnpropenyliutn cation 7 with two eqttivaletits ol 'silyl enul etbers 8. lbey are characterized by means of thcir speetroscopic data anal by X-ray analysis of '9c us cyelic 7-hydr0xy-2 ‚4 ‚6-heptatrien-t-one Systems with intramolceular H-bonding (type l0) ...