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2 Bulletin of the Polish Academy of Sciences. Chemistry

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Diacetylene omega-glycols. Etherates - adducts of 1,6-di(p-halogeno)-1,6-diphenylhexa-2,4-diyne-1,6-diols with diethyl ether and dioxane

Jasiobędzki W., Moszczyński-Pętkowski R., Woźniak-Kornacka J.

Bulletin of the Polish Academy of Sciences. Chemistry

2001

Vol. 49, No. 3

225-234

Stable, crystalline adducts of the title diols (F, Cl, Br, I) with diethyl ether and dioxane have been obtained. Spectral properties have been described. No formation of etherates from tetraphenyl diols not containing halogen atoms (1) has been found.

Reaction of acetylenic gama-glycols. XXXVI. Diastereoisomerism (Meso and rac.) of title diols and their gama-disubstituted derivatives (dihalogene, diethers) investigated by NMR-impact of the steric crowding

Jasiobędzki W., Woźniak-Kornacka J.

Bulletin of the Polish Academy of Sciences. Chemistry

1998

Vol. 46, No. 4

361-374

The (1) H NMR and (13) C NMR spectra were carried out for disecondary and ditertiary aliphatic-, aliphatic-aromatic- and aromatic-substituted acetylenic r-glycols and for r-substituted dihalogenes or diethers (overall 28 compounds).1H NMR can be applied as an analytical method for quantitative composition determination in diastereoisomeric mixtures of aliphatic- and aliphatic-aromatic compounds. It was observed that in NMR (1H and 13C) considerable differences occur in the shifts of the protons or the carbon atoms(doubling of the signals), first of all for substituents at 1,4-position of the but-2-yne chain. The differences between two-fold positions of the signals (, Hz) increase with an increase in the steric overcrowding at optically active carbon atoms [l, 2].