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Isotopic exchange of active methyl hydrogens. II. Deuteration of diphenylmethylpyrylium and methyltropylium salts

✍ Scribed by E. Gǎrd; I. Bally; A. Vasilescu; A. Arsene; A. T. Balaban


Publisher
John Wiley and Sons
Year
1965
Tongue
French
Weight
318 KB
Volume
1
Category
Article
ISSN
0022-2135

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Isotopic exchange of active methyl hydro
✍ Eugenia Gǎrd; Alice Vasilescu; G. D. Mateescu; A. T. Balaban 📂 Article 📅 1967 🏛 John Wiley and Sons 🌐 French ⚖ 366 KB 👁 1 views

The deuteration and dedeuteration of 2,4,6-trimethylpyrylium perchlorate in water (D20 and HzO, respectively) was studied by nuclear magnetic resonance using as a quantitative standard for protons tetramethylammonium bromide. y-Methyl groups exchange faster than u-methyl groups; P-standing hydrogens

Isotopic exchange of active methyl hydro
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Isotope exchange of active methyl hydrog
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From 2,4,6-tri-da-methylpyryliurn perchlorate the title compounds II-V were obtained by reaction with aqueous or gaseous ammonia, aqueous sodium hydroxide, aqueous hydrogen peroxide and sodium cyclopentadienide, respectively. The preparation of II-IV in aqueous solution proves that the nucleophilic

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## Abstract The title compounds 1a‐c and 2 werre reacted with several doubly activated methylene components to yield the cyclic ketene __S,N__‐acetals 3‐10.