Bonding weaker than covalent

The ability of functional groups to act as hydrogen bond acids and bases can be obtained from either equilibrium constants for 1 1 hydrogen bonding or overall hydrogen bond constants. See Abraham, M.H. Platts, J.A. J. Org. Chem. 2001, 66, 3484. 

March s Advanced Organic Chemistry Reactions, Mechanisms, and Structure, Sixth Edition, by Michael B. Smith and Jerry March Copyright 2007 John Wiley Sons, Inc. 

The intramolecular 0-H N hydrogen bond in hydroxy amines is also rather strong. 

Many studies have been made of the geometry of hydrogen bonds, and the evidence shows that in most (though not all) cases, the hydrogen is on or near the 

Intermolecular hydrogen bonding raises boiling points and frequently melting points. 

Hydrogen bonds can exist in the solid and liquid phases and in solution. Many organic reactions that will be discussed in later chapters can be done in aqueous 

When two compounds whose molecules form hydrogen bonds with each other are both dissolved in water, the hydrogen bond between the two molecules is usually greatly weakened or completely removed, because the molecules generally form hydrogen bonds with the water molecules rather than with each other, especially since the water molecules are present in such great numbers. In amides, the oxygen atom is the preferred site of protonation or complexation with water. 

In certain cases. X-ray crystallography has shown that a single H—A can form simultaneous hydrogen bonds with two B atoms bifurcated or three-center hydrogen bonds). An example is an adduct (1) formed from pentane-2,4-dione (in its 

Hydrogen bonds are important because of the effects they have on the properties of compounds, among them  

---

BONDING WEAKER THAN COVALENT metallocenes is much stronger. 

March, J. (1992) Bonding weaker than covalent. In Advanced organic chemistry reactions, mechanisms and structure. Wiley, New York, 75-79. 

---