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By Alan R. Katritzky

Validated in 1960, Advances in Heterocyclic Chemistry is the definitive serial within the area--one of serious significance to natural chemists, polymer chemists, and plenty of organic scientists. Written via proven specialists within the box, the excellent studies mix descriptive chemistry and mechanistic perception and yield an realizing of ways the chemistry drives the houses.

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5 Hz because of overlap between the n-electrons of the phenyl group and the axial lone pair of N(2) (70T701). 26 ISTVAN HERMECZ [Sec. 8 Hz), it was concluded that cis-3,4a-H-2-methyl-3-alkyl(methyl and ethyl), trans-4,4a-H-2,4-dimethyl-, cis-4~8,-H-2,8-dimethyl-,and 2tert-butyl-8-methylperhydropyrido[1,2-c]pyrimidinesexist predominantly as the trans-fused conformer Teq,with an equatorial C-alkyl group, whereas cis-4,4a-H-2,4-dimethylperhydropyrido[l,2-c]pyrimidine exists predominantly as the conformer Teqwith an axial C-methyl group.

The phenyl ring is perpendicular to the best plane of the bicycle. c. PYRIDO[l,2-C]PYRIMIDINESAND THEIRBENZODERIVATIVES 1. Thermodynamic Aspects A selective reversed-phase HPLC method was developed for studies on the antiarrhythmic hexahydro-3H-pyrido[1,2-c]pyrimidin-3-one(18) and its 4-epimer (87MI7). 3) of 18 were determined by titration (87MI2). The protonation constant of 2-amino-4-aryl6,7-dihydropyrido[6,l-a]isoquinolinium chlorides were determined in 50% aqueous ethanol, and their pK,s were calculated via Eq.

The enantiomers of 6,10,1l,llu-tetrahydropyrido[l,2-c][1,3]benzoxazin-6one were quantitatively separated by means of HPLC on swollen microcrystalline triacetylcellulose with ethanol-water (96 :4) as the mobile phase. The first-eluted enantiomer had the R configuration (91ACS716). The elecrochemical reduction of l-hydroxymethyl-9,1O-dimethoxy-4cyclohexylimino-1,2,4,5,6,llb-hexahydro[ 1,3]oxazino[4,3-a]isoquinolineon a dropping Hg electrode was studied (87PHA858). B. PYRID0[1,2-C][1,3]THIAZINES AND THEIR BENZODERIVATIVES 1.

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