The chemistry of spiroacetals. Approaches to the novel 1,6,8-trioxadispiro[4.1.5.3]pentadecane ring system

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Abstract
The synthesis of saturated bis-spiroacetal (11) from an intramolecular catalysed cyclization of a keto-epoxide together with the preparation of unsaturated bis-spiroacetal (16)via a Barton-type reaction of substituted hydroxy spiroacetal (15) highlight a means of constructing the above-named ring system.