IONIZATION OF o-ALLYLPHENOL AND o-PROPYLPHENOL AND INTRAMOLECULAR HYDROGEN BONDING
01 Sep 1963-The Journal of Physical Chemistry (American Chemical Society)-Vol. 67, Iss: 9, pp 1933-1935
About: This article is published in The Journal of Physical Chemistry.The article was published on 1963-09-01. It has received 4 citations till now. The article focuses on the topics: Halogen bond & Intramolecular force.
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TL;DR: The acid ionization constants of estrone, 17 beta-estradiol and 2-methoxyestrone have been determined spectrophotometrically and shown to be consistent with the additivity of substituent effects of the phenol ring.
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01 Aug 1982TL;DR: The ionisation constants of 2-nitrobenzidine, 2,2'-dinitrobenzinzidine and 2,3'dinitronzidine were determined spectrophotometrically in 33-3% (w/w) methanol as mentioned in this paper.
Abstract: The ionisation constants of 2-nitrobenzidine, 2,2’-dinitrobenzidine and 2,3’-dinitrobenzidine were determined spectrophotometrically in 33-3% (w/w) methanol. The low pK value obtained for 2,3’-dinitrobenzidine when compared to that of 2-nitro and 2,2’-dinitrobenzidines is explained on the basis of electron withdrawing nature of the nitrogroup and intramolecular hydrogen bonding.
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TL;DR: In this paper, it was shown that the rearrangement of allyl 2-thienyl and allyl 3-THienyl sulfides in various solvents at 89-136°C gives the corresponding allylthiophenethiols, which can subsequently undergo transallylation with the starting sulfide and cyclization to thienodihydrothiopyrans and methyldihydro-rothienothiophenes.
Abstract: It is shown that the rearrangement of allyl 2-thienyl and allyl 3-thienyl sulfides in various solvents at 89–136°C gives the corresponding allylthiophenethiols, which can subsequently undergo transallylation with the starting sulfide and cyclization to thienodihydrothiopyrans and methyldihydrothienothiophenes. The energy of activation of the rearrangement of both isomeric sulfides is 19 kcal/mole. The pKa values of thiophenyl and some thiols of the thiophene series were determined, and it was established that the acidities of the allylthiophenethiols do not have a decisive effect on their ability to undergo cyclization.