Recent developments in Glaser coupling catalysed by copper(i) is discussed in the review with emphasis on its application.

The classical heterocoupling of a 1-haloalkyne with a terminal alkyne catalyzed by copper salts in the presence of a base for the synthesis of unsymmetrical diynes is termed the Cadiot-Chodkiewicz coupling reaction. The diynes are of great importance due to their biological, optical and electronic properties. A number of modifications have been developed recently to improve the efficiency of Cadiot-Chodkiewicz coupling reactions in terms of selectivity and yield. This is the first review on the Cadiot-Chodkiewicz cross-coupling reaction which highlights the modern approaches and protocols developed for the synthesis and applications of unsymmetrical 1,3-diynes.

The influence of different conditions on the mechanical properties of short coir fiber reinforced polymer composites as well as glass fiber reinforced polymer composites have been analyzed and compared. Fiber length of 20 mm was found to be optimum for the best result. It is observed that the filler loading of 30 phr was most suitable for best results. Degradation studies were carried out in different solvents like 10% NaOH, 1 N HCl, and 10% NaCl and water. The effect of these solvents and water on the mechanical properties of the composites was studied in detail. The deterioration of mechanical properties of the coir/PE and glass/PE composites by environmental weathering was also studied.

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