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Why is triethylene glycol solvent a

Publication date: Available online 22 February 2017 Source:Chemical Engineering and Processing: Process Intensification Author(s): Alessandro Pratesi, Samuele Stazzoni, Marco Lumini, Giuseppina Sabatino, Alfonso Carotenuto, Diego Brancaccio, Ettore Novellino, Marco Chinol, Paolo Rovero, Mauro Ginanneschi, Anna Maria Papini This work describes the synthesis of thirteen cyclooctapeptides dicarba-analogues of Somatostatin, containing l- or d-allylglycine (Agl) residues at the termini of the peptide chain, through on resin Ring Closing Metathesis (RCM) of the linear octapeptides. We investigated the influence of the stereoche...

Why is triethylene glycol solvent a "catalyst" in a synthesis of Diphenylacetylene

Preparation of -Stilbene Dibromide and its Conversion to DiphenylacetyleneReference: Ege, Chapter 8In this experiment, you will carry out the electrophilic bromination of E-1,2-diphenylethene (E-stilbene), and then convert the product into diphenylacetylene by a dehydrohalogenation reaction.

Synthesis of Diphenylacetylene from Stilbene

Conversion of -Stilbene Dibromide to DiphenylacetyleneAlkynes are commonly prepared by the dehydrohalogenation of 1,2-dihalides under basic conditions.

Normally, a very strong base such as sodamide (NaNH2) is necessary, but treatment of -stilbene dibromide with potassium hydroxide leads to the formation of diphenylacetylene in high yield.Procedure: Place 1 g of -stilbene dibromide, 8 pellets of potassium hydroxide (ca.

If a solvent like triethylene glycol is used, ..

(Place your diphenylacetylene in the jar provided.)Be sure to comment on any differences between the melting point of your products in parts 1 and 2 and those of the pure compounds:-1,2-dibromo-1,2-diphenylethane: m.p.

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