The demand for organosilicon elastomers used in the production of thermally resistant rubbers and organosilicon polymers for making non-metal composite materials is increasing from year to year.This monograph presents a discussion on the methods used for synthesizing and studying properties of newly designed organosilicon polymers, namely organosiloxane copolymers with cyclolinear structure of macromolecules.This book presents an overview of data on methods of synthesizing primary linear and cyclic organosiloxanes of various structures.This book will be of value and interest to researchers working in the field of chemistry of organosilicons.