Question

differncite between terminal and non terminal alkyne? please give answer in points​

Answer 1

Answer:

Distinguish between terminal and non terminal alkyne

A Terminal Alkyne is an alkyne in whose molecule there is at least one hydrogen atom bonded to a triply bonded carbon atom. Or simply,the alkynes in which the triple bonded carbon atoms are at the extreme positions. ... Non-Terminal Alkynes,on the other hand have triple bond at any place other than the end postions.

Explanation:

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Answer 2

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A Terminal Alkyne is an alkyne in whose molecule there is at least one hydrogen atom bonded to a triply bonded carbon atom. Or simply,the alkynes in which the triple bonded carbon atoms are at the extreme positions. ... Non-Terminal Alkynes,on the other hand have triple bond at any place other than the end postions.

These kind of reactions are carried out by means of a catalytic process where control over conversion and selectivity can be exerted in different ways, e.g.: by varying a) the active species or b) the support, and/or by adding c) a promoter / a poison / a modifier, and finally, and not less important, by modifying the reaction temperature. Examples of factor b) are: mesoporous [6] and siliceous [7] materials, a pumice [8], carbons [9], and hydrotalcite [3]. Cases of factor c) are the typical Lindlar catalyst (palladium heterogenized on calcium carbonate poisoned by lead acetate or lead oxide, Pd-CaCO3-Pb) [10] and the presence of quinoline and triphenylphosphine [11,12]. Research on factors a) and c) include bi-elemental systems such as Ni-B, Pd-Cu, etc. [13-19]. An example of the effect of the reaction temperature is a paper by Choi and Yoon, who found that the selectivity to (Z)-alkene increases when the temperature decreases using a Ni catalyst [20].

Explanation:

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