Bromomesityl oxide

The acid-catalyzed cyclization of the diol (209), available from penta-1,3-diene and bromomesityl oxide via the hydroxyketone, gives a mixture of the fused dihydropyrans (210) and (211), edulan I and II, respectively (Scheme 40) <75JCS(P1)1736). The former compound predominates when an ion exchange resin is used as the catalyst, but the latter... 

Diels-Alder catalyst (1, 31 -32 2, 21 22 3, 8-9). The Diels-Aldcr adduct (1) of 1,3-pcntadicnc with 3-bromo-4-methylpentcne-3-one-2 (bromomesityl oxide) can be... 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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