The present voLume continues the series on "Organotin Compounds" which first appeared in 1975 and now comprises a coLLection of fourteen voLumes. The overaLL pLan of the series has been given in the preface of VoLume 1. The present VoLume 14 continues the description of the mononucLear organotin compounds with tin-oxygen bonds (Chapter 1.4.1). Treatment of organotin compounds with tin-sulfur, -selenium, and -teLLurium bonds appeared earLier in Chapters 1.4.2 to 1.4.4 of VoLumes 9, 1982, and 10, 1983. VoLume 14 contains RSn-oxygen compounds with R = methyL, ethyL, and prapyL, covering 2 the Literature compLeteLy to the end of 1985. AdditionaL voLumes describing tin-oxygen compounds with other RSn and RSn groups with foLLow in the near future. 2 Abbreviations and symboLs are expLained on pp. X/XI aLong with other remarks. We thank Prof. Dr. Dr. h. c. Ekkehard FLuck and his coworkers at the GmeLin Institute for their exceLLent cooperation. In particuLar, we thank Dr. ULrich Kruerke for his accurate and sympathetic editing, Mr. Edgar RudoLph for preparing the index, Dr. Grant for reading the EngLish text, and Mr. Hans-Georg Karrenberg for drawing the numerous formuLas and moLec- uLar structures. We thank Mrs. ELLen Redlinger, Miss Susanne Schumann, and Miss Stefanie Schumann for their meticuLous handling of the Literature index and the members of the chemicaL department of the Library at the Technische Universitat Berlin for their assistance in searching and acquiring the references fram the Literature.