In our previous investigations reactions of ferrocyl acetates and derived quaternary salts with alkoxides formed from methyl 2-hydroxyalkanoates were performed, giving methyl ferrocyloxyalkanoates and ferrocyl methyl ethers.1 This report is dealing with transformations of the same alkanoates with the homologous substrates containing ferrocene nucleus in b- and g-position in relation to (against, towards) the reaction center. By action of PBr3 on FcCH2CHROH (1a, R=H; 1b, R=Me; 1c, R=Ph) and FcCH2CH2CH2OH (2) in benzene abs. the corresponding bromides FcCH2CHRBr (3a, R=H; 3b, R=Me; 3c, R=Ph) and FcCH2CH2CH2Br (4) were obtained. Heating of compounds 3 and 4 in a large excess of methyl glycolate or methyl lactate in the presence of sodium gave 31-65% of transesterification products accompanied by a small quantity of w-ferrocenyloxaalkanoates 7. Mechanisms expliciting the different course of reactions performed and those described in paper1 will be presented.

: Ultrasonic flowmeter works on the principle of transmitting and returning ultrasonic waves that pass through the liquid, ie. fluid, and is used to measure the speed of fluid movement through a pipeline or some other structural form of fluid movement. By knowing the velocity of the fluid and the cross-sectional area of the pipeline or other system, the value of the volumetric or mass flow can be obtained indirectly. Fluid flow measuring device model OMNI TDI 200H owned by the laboratory of the Biotechnical Faculty was used for the first time to measure the flow of purified water at the outlet of the plant device of the training center "Grmeč", built as a pilot plant. The paper will describe the role and importance of flow measurement by the conventional method and present the results of the trial operation of an ultrasonic flow meter, model OMNI TDI 200H.