الفهرس 
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Abstract
Introduction union includes Literature survey of the general atoned of synthesis ang chemical enkolpion ones. The second chapter as devoted to the discussion of the original work of the canaicate unicn compris the following: A saries of claryitetranyaro-siethlopyran. ones ues ayntnesis reaction of dteryli atone with hycrogen euifice in the presence of sogiue The structure and stereochemistry of th unce vere astablished by atucy of their spectral cnaracters sticon, Theis th nmr spectre clearly demonestrated that compouncs ere the cis isomers the to evry groups occupying the stationery aiequstorisl conforsstion. Further confiraotion of their structure ues mttuined from tort infrared, ultraviolet anc sass spectra Oxidetion of tetrenyarotnionyrones vith bromine vater geve the correrponging sulforices nile their ronction vith hydrogen peronice ec to the formation of tne sulfone aha-e. Sieber to the parant tetrahyorothionyrones.