This book is about the modern synthesis method of formamides by N-formylation of amines. This book elaborating nano particle activity during the reaction mechanism and how yield is affecting by nano-particles of Au,Ag,CeO2 etc. formation of formamides in solvent free condition is also introduced and catalyzed coupling reaction by various organometallic reagent is the theme of this book. This book explores the future prospects for the new methods of formamides synthesis and trying to give new dimensions in the research field of N-formylation. This book also deals with the properties of formamides that is catching a important attraction in pharmaceuticals and environmental studies.