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Updated: May 24, 2026

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
1-(3-Hy-droxy-phen-yl)-3-(3-meth-oxy-phenyl)thio-urea
Abstract:
In the title compound, C(14)H(14)N(2)O(2)S, the dihedral angles between the thio-urea group and the methoxyphenyl and hydroxyphenyl rings are 61.91 (4) and 76.90 (4)°, respectively. The benzene rings are twisted with respect to each other, making a dihedral angle of 71.03 (4)°. The H atoms of the thio-urea NH groups are positioned anti to each other. In the crystal, inter-molecular N-H⋯S, N-H⋯O and O-H⋯S hydrogen bonds link the mol-ecules into a three-dimensional network.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.

