. alpha.-Haloalkanesulfonyl bromides in organic synthesis. 5. Versatile reagents for the synthesis of conjugated polyenes, enones, and 1, 3-oxathiole 1, 1-dioxides

~%

~%

~%

~%

~75%

~%

~%

~65%

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~%

~56%

~%

~%

~%

~%

~13%

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~%

~%

~%

~25%

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~%

~%

~79%

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~%