Key to Carotenoids

In 1948 Paul Karrer and Ernst Jucker compiled the first comprehensive book on the topic of carotenoids. Their work included a list of 65 natural carotenoids with known and unknown structures. In Otto Isler's 'Carotenoids' which appeared in 1971, Otto Straub published a new and expanded 'List of Natural Carotenoids' comprised of 273 compounds and included all the literature data known at the time. This list proved to be of such value to those working in the field of carote- noids that 5 years later Otto Straub came out with an up- dated version ofthelist entitled 'Key to Carotenoids'. The present second edition of 'Key to Carotenoids' endeavors to provide the reader with the continuation of Straub's work. I would like to thank my collaborators for their work and especially Birkhauser Verlag, Basle, for their support. H. P. Pfander TABLE OF CONTENTS LIST OF THE NATURAL CAROTENOIDS...9 1 * HYDROCARBONS. * * * * * * * * * * * * * * * * * * * * * * . * * * * * * * . . * * .