Carbon-nitrogen-oxygen rings

A chiral [4]pseudocatenane 16 was synthesized from chiral triptycene-based /m( crown ether) and three equivalents of hw[p-(but-3-enyloxy)benzyl]ammonium salt in CH2CI2 in the presence of Grubbs II catalyst, followed by reduction 06CEJ5603 . Several novel calix[4]arenocrowns were prepared by a simple one-pot reaction of calix[4]monohydroquinone diacetate with bw-tosylates, e.g. l,4-bw[2-(2-(2-(2-tosyloxy-ethoxy)ethoxy)ethoxy)ethoxy)benzene, in dry MeCN in the presence of NaOH the self-assembly into calix[4]areno[2]catenanes with a dicationic salt and / -bfr(bromomethyl)-benzene was also demonstrated 06TL6012 . 

A series of 7V,7V-dialkyl-4,13-diaza-18-crown-6 lariat ethers partial fluorinated alkyl side chains was synthesized by the alkylation of 4,13-diaza-18-crown-6 07JOC3735 . The 

The synthesis of a bis-macrocycle (29) as the central core possessing two back-to-back rigidly connected 1,10-phenanthroline units was prepared from the macrocyclic dione 30 and act as molecular handcuffs as demonstrated by their two-step conversion to a bis-Cu(II) complex with 2,9-[di-p-(3-butenyloxyphenyl)]-l,10-phenanthroline, followed by a ringclosing metathesis reaction to give the desired catenane 31 07CC4410 . 

The reaction of (/ )-2,2 -di(bromoethyloxy)-l,r-binaphthyl with 4,4 -bipyridine gave bis-pyridinium complex, which with l,3-di(dibromomethyl)benzene afforded (9.4%) of the bis(dipyridinium) complex 32 07OL5393 . 

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CARBON-OXYGEN/CARBON-NITROGEN-OXYGEN RINGS... 

CARBON-NITROGEN-(OXYGEN and/or SULFUR)]" (n > 1) RINGS (CATENANES)... 

CARBON-NITROGEN-OXYGEN/SULFUR-METAL RINGS... 

All of the atoms in the ring may be carbon, nitrogen, oxygen or sulphur (II)... 

Cyclic organic compounds are classified as carbocycles or as heterocycles. CarbocycJic rings contain only carbon atoms, but heterocyclic rings contain one or more different atoms in addition to carbon. Nitrogen, oxygen, and sulfur are the most common heteroatoms. 

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