Chemical Structure / July 19, 2018 / Willa Page
Several sulfonic acids occur naturally—for example, the essential nutrient taurine (2-aminoethanesulfonic acid; NH2CH2CH2SO3H), the sulfobacins and other sulfonolipids (the biologically active products from bacterial cultures that contain 15- to 17-carbon chains attached to the carbon and nitrogen of 2-aminoethanesulfonic acid), and the echinosulfonic acid C (an α-hydroxysulfonic acid containing two brominated indole rings).
A degree of π-bonding has been proposed to explain the short B-Cl distance although there is some debate as to its extent. It does not dimerize, although NMR studies of mixtures of boron trihalides shows the presence of mixed halides. The absence of dimerisation contrasts with the tendencies of AlCl3 and GaCl3, which form dimers or polymers with 4 or 6 coordinate metal centres.
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