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Crown ether resorcin[4]arenes 1a, 1b, and 2b with a novel connectivity have been prepared from diquinoxaline cavitands in yields of 68%, 73%, and 25%, respectively. The reaction involves bridging the contiguous oxygen atom pairs with tri-, tetra- or pentaethylene glycol ditosylates.
Reduction of malonaldehyde bis(ethylene and propylene acetals) with borane or monochloroborane produces diether diols 1 and 2 in high yield. Similar reduction of glyoxal bis(ethylene acetals) has only limited utility for the preparation of tetrasubstituted triethylene glycols 3. Organotin chemistry is complementary: stannylene acetals prepared from disubstituted vicinal diols can be alkylated with...
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