1. Why high pressure?

Pressurization of mostly liquid media is less common than gas compression (used in hydrogenation or carbonylation reactions, for example). In fact, the pressure range considered goes far beyond what is usually understood by "high pressure", since it ranges from 2 to 20 kbars.

The SI unit of pressure is the pascal :

1 Pa = 1 {N/m}^{2} et donc 0,1 MPa = 1 atm

but bar is also commonly used:

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Why high pressure?

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page High-pressure organic synthesis

Fundamental concepts

Bibliography

(1) - VAN ELDIK (R.), HUBBARD (C.D.). - Chemistry under extreme or non-classical conditions - (Chimie en conditions extrêmes ou inusuelles). – Wiley, 555 p. (1997).
(2) - ROENTGEN (W.) - Kurze Mittheilung von Versuchen über den Einfluss des...