Control cyclo converters

Power eonverter terminology can be confusing. Traditionally, a.c. to d.c. converters were referred to as rectifiers, d.c. to a.c. converters as inverters, d.c. to d.c. converters as ehoppers, a.c. to a.c. (at same frequency) as a.c. power controllers, and a.e. to a.e. (at dilferent frequencies) as cyclo-converters [26]. Power eleetronie systems often eombine multiple conversion processes and are often simply referred to as converters or power-conditioning systems. 

In a thermodynamically controlled reaction, 3-oxo-e.vo-tricyclo[4.2.1.02 s]nonane is converted to e. vo-3-hydroxy-e.vo-tricyclo[4.2.1.02,5]nonane (85-95%). With sodium borohydride the ewfo-alcohol is obtained185. For example, the Meerwein-Ponndorf-Verley reduction of camphor yields a 70 30167 (75 2525, 69 31 186) mixture of the exo- and endol,7,7-trimethylbi-cyclo[2.2.1]heptan-2-ols (isoborncol and borneol). The equilibrium has been established to give a 29 71 mixture of isoborneol and borneol183, giving another example where the Meerwein-Ponndorf-Verley reduction leads predominantly to the less stable product. 

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