*2.2.1 Dehydrogenative oxidation of alcohols*

Ir-NHC complexes were synthesized in aqueous media for the oxidation of secondary alcohols to ketones. In addition, primary alcohols were transformed to carboxylic acids in the absence of a base [30].

**Figure 4.** *Formylation of amines with CO2 and hydrosilanes.*

*Late Transition Metal (LTM)-NHC Catalyzed Transformations of Renewable Chemicals… DOI: http://dx.doi.org/10.5772/intechopen.101164*

#### **Figure 5.**

*Mechanistic approach for carboxylation of terminal alkynes.*

**Figure 6.** *N-methylation of amines.*

#### **Figure 7.** *Carboxylation of terminal alkynes.*

**Figure 8.** *Carboxylative cyclization of propargylamine.*
