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4,4'-Bipyridine-3-(thio-phen-3-yl)acrylic acid (1/2)
Palanisamy Rajakannu1, Firasat Hussain, Malaichamy Sathiyendiran
1Department of Chemistry, University of Delhi, North Campus, Delhi, India.
Abstract:
In the title 1/2 adduct, C(10)H(8)N(2)·2C(7)H(6)O(2)S, the dihedral angle between the pyridine rings is 18.41 (11)°. In the thio-phene-acrylic acid mol-ecules, the dihedral angles between the respective thio-phene and acrylic acid units are 5.52 (17)° and 23.92 (9)°. In the crystal, the components are linked via O-H⋯N hydrogen-bonding inter-actions, forming units of two 3-thio-phene-acrylic acid mol-ecules and one 4,4'-bipyridine mol-ecule.
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02:42Acidity of 1-Alkynes
The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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