The present book has written especially for the research and post graduate students working in the area of Green and Synthetic Organic Chemistry. Green chemistry principles are of highest interest due to their use as new methodology and environmentally benign synthetic strategies for different series of various heterocyclic compounds. Hence, the green synthesis of organic molecules has generated vast interest to organic as well as for medicinal chemists and industrialists. Keeping this in mind, I have undertaken the compilation of different syntheses from reputed research articles. The book consists of five topics including introduction, general method of synthesis by Ultrasound irradiation, characterization data and literature survey. This book has demonstrated the various organic reactions by sonochemical synthesis with specified example from my Ph. D. work. I hope this book will help many researchers who are working in the area of green chemistry as well as synthetic organic chemistry for various heterocycles. 

At last, I am thankful to all the authors of research papers whom has been discussed in the writing of this book. Suggestions for further improvement of the book will be gratefully acknowledged.